(Baron Louis Bernard), a celebrated Chemist; known also as an advocate of eminence, and less advantageously, in his political character, as a regicide; son of Antony Guyton de Morveau and Margaret de Saule his wife, was born at Dijon, 4th January 1737.

His father was of a respectable family, and filled the situation of a Professor of Civil Law in the University of Dijon. He was fond of building; and from the artificers who were frequently employed about his house, young Guyton appears to have derived, almost in his infancy, a taste for mechanical pursuits, which led to an astonishing development of premature talent. For when he was only seven years old, he prevailed on his father to purchase, for his amusement, a clock which was greatly out of repair, and, as is said, he actually put it together and remedied its defects, without any assistance, so effectually that it continued to go extremely well for 50 or 60 years afterwards. The next year he was equally successful in cleaning and repairing a watch belonging to his mother. But, notwithstanding these remarkable exertions of ingenuity, it does not appear that they depended on any particular bent of the genius to the cultivation of the mechanical arts: at least no such bent was ever exhibited in any of his subsequent pursuits. His education was conducted in the ordinary manner at a provincial school or college, which he left at 16. Upon his return home he applied, for a short time, to botany, and he was soon after admitted as a student of law in the University of Dijon, where he remained for three years, and then removed to Paris, in order to continue his studies at the bar. In 1756, he paid a visit to Voltaire at Ferney, and he seems to have imbibed from this personage a taste for satirical poetry, which he soon afterwards displayed, upon the occurrence of a trifling accident, in a ceremony relating to a popular Jesuit of the day. Among his posthumous papers, also, he left some unfinished sketches of tragedies, which are said not to have been deficient in poetical merit.

At the age of 24, when he had made some progress in the practice of his profession as an advocate, his father procured for him, at the price of 40,000 francs, the appointment of Advocate-General of the Parliament of Dijon, so that he had no farther solicitude for the acquisition of an income adequate to his competent subsistence. His health was then considered as delicate; but the fears which were entertained for it proved to be completely groundless.

In January 1764, he was made an honorary member of the Academy of Sciences at Dijon, then lately established under the patronage of the Prince de

* See Humboldt's Travels; El Viagero Universal, por Estalla; and Voyage à la partie Orientale de la Terre Ferme, par Depons. Condé. This occurrence seems to have had considerable influence on the pursuits which occupied his leisure hours; and he soon became by far the most distinguished ornament of the Academy which had paid him the compliment. His particular application to chemistry arose in a great measure out of an accidental emulation with Dr. Chardenon, who afterwards very liberally undertook to assist him in the cultivation of this branch of science. He studied the works of Macquer and of Beaumé, and he was furnished by the latter with the materials necessary for the establishment of a small laboratory for his own use.

With regard to the more general cultivation of literature and science, he displayed considerable talent in a memoir on public instruction, together with a plan for a college, which he presented to the Parliament of Burgundy, insisting, with great force and success, in opposition to Diderot, on the importance of early education in modelling the character of the human mind. He wrote also, about the same time, for a prize essay, an Encomium on Charles V. of France, surnamed the Wise, which was afterwards inserted in the collection of his Discourses, published in three volumes.

In July 1767, he visited Paris with a view to the advancement of his scientific pursuits, and excited the admiration of the most celebrated chemists of the day, by the facility which he had acquired in the manipulation of his experiments. He entered, after his return, into the investigation of the great question respecting the oxydation of metals, though he did not succeed in removing the difficulties which then embarrassed it. In 1769, he pronounced, at the opening of the Parliament, an elegant oration upon morals. He was soon afterwards engaged in some experiments respecting the communication of heat to different substances, the results of which, though not published, were of some importance to the theory of temperature. At the request of his friend Dr Durande, he undertook to inquire into the nature of biliary calculi, which he found to be readily soluble in ether; and it appears that a combination of ether and oil of turpentine was of advantage to several of Dr Durande's patients, who were suffering from these concretions.

In the year 1773 he was employed in an interesting investigation of the mutual adhesion of the surfaces of solids and fluids, a class of phenomena of which the mathematical theory was never at all understood, until the publication of an essay on the Cohesion of Fluids in the Philosophical Transactions, soon after the beginning of this century, in which the laws of capillary action are extended to a complete analogy with all the experiments of M. de Morveau, as well as those of Taylor and Achard of a similar nature. He succeeded, about the same time, in discovering a mode of destroying the contagious vapours of pestilential diseases, by fumigation with the muriatic acid gas; he afterwards found the oxymuriatic acid, or pure chlorine, still more effectual; and it does not appear that the nitric acid, afterwards proposed in England, has any advantages over either of these substances.

M. de Morveau's anxious desire to cooperate in the promotion of chemical knowledge induced him to make a new exertion in its favour, by undertaking, in 1776, to deliver a public and gratuitous course of lectures as a regular professor of the science, authorised by the approbation and encouragement of his brother magistrates at Dijon. He soon afterwards wrote some essays on the peculiar characters of the carbonic acid, and he strenuously combated the popular prejudice, which prevailed, against the introduction of conductors, for preserving buildings from lightning. He established a large manufactory of nitre, which was afterwards conducted by Mr Courtois, the father of the Mr Courtois that discovered iodine. From chemistry he naturally diverged into the study of mineralogy, and, in 1777, he made a tour through the province of Burgundy, with a view to the examination of all its productions; and he actually discovered a rich lead mine, though, for want of coal, it was impossible to derive much benefit from it. He also found a white variety of the emerald in the same province, as well as some combinations of barita, and he invented a new method of obtaining the pure barita from its sulphate.

He had long been intimately acquainted with the Count de Buffon and with Malesherbes, both persons distinguished by elegance of taste; the one in science, the other in general literature. In 1779 and 1780 he enlarged his connexions among the men of letters resident at Paris, and he was induced by Panckoucke, the bookseller, to undertake the chemical department of the Encyclopédie Méthodique: but it was six years before the Dictionary of Chemistry appeared; the articles relating to pharmacy and metallurgy were supplied by Maret and Duhamel. In the progress of this work he found himself compelled to disbelieve the existence of phlogiston as a distinct principle of inflammability, though at the beginning he had defended the doctrines of the old school. But he soon became one of the most zealous advocates of the new theory; and he contributed very much to its general introduction by the active part which he took in the arrangement of a new nomenclature. His proposals were at first thought objectionable by many of the members of the Academy of Sciences; but they soon became generally adopted throughout Europe: and the system was without doubt of great use for a time, so far as it assisted the memory and the imagination in retaining the discoveries and comprehending the theories which had so much of novelty to make them interesting. Among the original matter contained in the Dictionary were some researches on the nature of steel, which coincided in their results with those of Monge, Vandermonde, and Berthollet, made about the same time, but published somewhat earlier. The whole volume was received in the most flattering manner by all the lovers of chemistry; but it was not till 1791, that the author's ambition was gratified by the award of the Academy of Sciences, adjudging him a prize of 2000 francs, which had been allotted to the most useful work that should appear in the course of the year. The prize, however, he begged to offer to the exigencies of the state, which were then very urgent. The Dictionary was afterwards ably continued by M. de Fourcroy.

In the meantime, he condescended to appear as the translator of the Opuscula of Bergman, which he illustrated by notes. The example was followed by Madame Picardet, and by others of his friends, who were zealous for the promotion of science; so that the French chemists were speedily made acquainted, by these means, with the labours of all their contemporaries in different parts of the world. In the year 1787, Mr Guyton applied his speculations to a practical purpose, in establishing a manufactory of soda from common salt, exposed to the atmosphere, with a large proportion of lime, the soda slowly efflorescing as a carbonate. It was in the same year that, having published his Collection of Pleadings, he finally resigned his office at the bar, in order that the whole of his time might be devoted to the pursuit of science.

His next undertaking was of a more adventurous nature; for, in April 1784, he ascended with the President de Virly in a balloon, and he repeated the experiment in the month of June, hoping to be able to direct his aerial course at pleasure. The balloon appears to have been about thirty feet in diameter; and, when we consider the action of the wind upon a surface of such extent, we must be aware that every attempt to oppose or modify it must have been perfectly futile. He was visited soon after by the ingenious and lamented Mr Tennant, who went to Dijon purposely in order to become acquainted with him, and who had an opportunity to perform some original experiments in his laboratory. He was made a Member of the Royal Academy of Medicine at Paris, in 1786, as a compliment to the merits of his labours for the preservation of the public health. He received a visit, in the succeeding year, at once from MM. Lavoisier, Berthollet, and Fourcroy, together with Monge and Vandermonde; and our countryman, Dr Beddoes, who was travelling in France, had the good fortune to join this interesting party, all of them deeply engaged in the discussion of the great chemical questions which were then undecided. In April 1788, Mr Guyton was placed on the list of the Foreign Members of the Royal Society of London, and the same mark of respect was also paid him, at different times, by almost all the scientific societies of Europe.

In September 1791, he was unfortunately elected a member of the Legislative Body, and having also been made Solicitor General of his department, he could no longer continue the chemical lectures, which he had delivered without intermission for fifteen years, and he resigned his chair to Dr Chausier. It must not be omitted by an impartial biographer, that, on the 16th of January 1798, he thought himself compelled to vote with the barbarous majority; and it is a poor compensation for this fatal error that, in the same year, he resigned a pension of 2000 francs a year, in favour of that republic, to which he had already sacrificed the best feelings of justice and humanity. He afterwards became a Commissary of the Assembly, attached to the army of the Netherlands. In this capacity, besides many other instances of personal courage, he is said to have rendered essential service to his countrymen by the construction of a balloon, in which he ascended, together with some of the staff of General Jourdan, in order to observe the motions of the enemy during the battle of Fleurus. After his return to Paris, he was appointed Professor of Chemistry in the Ecole Polytechnique, and he was an effective cooperator in the first establishment of that useful institution. In 1795, he was again chosen a member of the Assembly of Five Hundred; and he was appointed by the government one of the forty-eight Members of the National Institute, then recently embodied. He had for some time been a correspondent, but was never a member, of the Academy of Sciences. His political engagements terminated in 1797, when he resolved to devote himself once more exclusively to science. In 1798, he fulfilled the duties of Director of the Ecole Polytechnique, during the absence of Monge, who was in Egypt, and for whom he insisted that the salary should be reserved. The following year, Bonaparte, then First Consul, made him a General Administrator of the Mint. He received the Cross of the Legion of Honour in 1803, and obtained, two years afterwards, still higher rank in the order, particularly as an acknowledgment for the public benefits which had been derived from his methods of fumigation. In 1811, he was elevated to the dignity of a Baron of the French empire.

From 1798 to 1813, he had continued his labours as Professor of Chemistry in the Ecole Polytechnique; he then obtained leave to retire, but he survived only a few years, and died of a paralytic affection, or rather of a total decay of strength, the 21st December 1815; at a period when he would shortly have had to encounter the effects of a retributive justice, which would have been very severely felt at so advanced an age. In stature he was rather below than above the middle size; his conversation was animated and copious, his manners courteous and obliging, and he was full of anecdote, and ready to communicate whatever information he possessed. He married, late in life, Madame Picardet, the widow of an academician of Dijon, whose tastes and pursuits were congenial with his own, and who had distinguished herself by translating several works of science and of literature from the different languages of the north of Europe. Of his numerous publications, a bare catalogue will be amply sufficient to show the extent of his researches and the variety of his pursuits. It is the more necessary to do justice to his diligence and perseverance, as we cannot easily point out any one important discovery or invention that can be considered as commensurate to the high promise of his early infancy. The article Acid of the Dictionary, and the Methodical Nomenclature, must be ranked as the best of his productions, but the character of both these is rather useful than splendid.

1. Le Rat Iconoclaste, poème heroicomique, 12. Dijon, 1763. 2. Mémoire sur l'instruction publique, 12. Dijon, 1764. 3. Elogie du Président Jeanin. Paris, 1766. 4. On the effect of air in combustion. Mém. Acad. Dij. I. 1769, p. 416. 5. Manière d'éprouver les charbons de pierre. Dijon, 1769. 6. Réflexions sur la boussle à double aiguille. Dijon, 1771. 7. Hauteurs barométriques. Dijon, 1771. 8. Consultation juridicochimique sur le charbon fossile. Dijon, 1771. 9. Plaidoyer sur l'époque de démence d'un tes- Guyton tateur. Dijon, 1772. 10. Digressions Académiques, de Morveau. 12. Dijon, 1772. 11. On a cold effervescence. M. Ac. Dij. II. 1771, p. 183. 12. On the displacement of a wood, and on a cavern, p. 225. 13. Défense de la volatilité du phlogistique. 12. Paris, 1772. 14. Réflexions sur le parallèle du phlogistique et du causticum. Dijon, 1773. 15. On the coal of Montenice in Burgundy. Journ. Phys. II. p. 445. 16. On platina, and its alloy with steel, VI. p. 193. 17. Discours Publics, 3 vols. Dijon and Paris, 1775. 18. On a fossil tooth. Journ. Phys. VII. p. 414. M. Ac. Dij. 1785. i. p. 102. 19. On the crystallization of iron. Journ. Phys. VIII. p. 348. IX. p. 303. Mém. Sav. étr. IX. p. 513. 20. Eléments de chimie théorique et pratique. 4 vols. 12. Dijon, 1777. "A clear and elegant compendium." 21. On metallic crystallizations. Journ. Phys. XII. p. 90. 22. On a singular petrifaction, XV. p. 89. 23. On some properties of manganese, XVI. p. 156. 24. On the red serpentine of Montolier, XVI. p. 443. 25. Opuscules de Bergman, 2 vols. 8. Dijon, 1780, translated, with notes. 26. On simple earths, especially absorbents, Journ. Phys. XVII. p. 216, XVIII. p. 68. 27. On the improvement of colours used in painting. M. Ac. Dij. 1782, p. 1. 28. On the congelation of sulfuric acid, p. 68. 29. On some ores of copper, p. 100. 30. On barita, p. 159. Journ. Phys. XVIII. p. 299. 31. On biliary concretions, in Durande's Memoir. M. Ac. Dij. 1782, i. p. 199. p. 26. 32. On the manufacture of nitre, p. 1. 16. 33. On an ore of lead, p. 41. 34. Lettre à M. J. Z. sur l'influence de l'éducation publique, Dijon, 1782. 35. On a sulphuret of zinc. M. Ac. Dij. 1783. i. p. 37. 36. On an incombustible coal, p. 76. 37. On a spirit lamp for experiments, p. 159. 38. On the acetate of bismuth, p. 187. 39. On the karabic or succinic acid, ii. p. 1. 40. On an areometer for sugar boilers, p. 52. 41. On a meagre limestone of Brion, p. 90, fit for terras. 42. On the nephitic gas contained in water. 1784, i. p. 85. 43. On the alteration of gold boiled in nitric acid, ii. p. 133. 44. On the natural dissolution of quartz. Swed. Trans. 1784. M. Ac. Dij. 1785, i. p. 46, 60. 45. On sugar and its acid, p. 90. 45. Description de l'aérostat de l'Académie, Dijon, 1784. 46. Plaidoyers sur plusieurs questions importantes. 4. Dijon, 1785. 47. On the conversion of iron into steel, and on plumbago, Journ. Phys. 1786, 308. 48. Encyclopédie méthodique, chimie, Vol. I. 4. Paris, 1786, with Maret and Duhamel, noticed Ann. Chim. VII. p. 24. 49. Méthode de nomenclature chimique, 8. Paris, 1787. By de Morveau, Lavoisier, Berthollet, and de Fourcroy. 50. On the reduction of an oxyd. Ann. Chim. I. p. 106. 51. On adamantine spar, p. 188. 52. On the expansion of gases, p. 256. 53. On adhesion, VII. p. 32. 54. On the affinity of mercury with metals, p. 42. 55. On some pneumatic apparatus, p. 50. 56. On the alteration of solutions heated in glass vessels, IX. p. 3. 57. On saturation and supersaturation, X. p. 38. 58. On a gravimeter, XXI. p. 3. 59. On a French hyacinth, p. 72; containing Zirconia. 60. Notice of a scientific institution at Erfurt, XXII. p. 81. 61. Extract of a work on the agriculture and arts of Spain, p. 310. 62 Report of the labours of the society at Rouen, p. 320. 63. Notice of Nicholson's Journal, XXXIII. p. 173. 64. On a native sulphate of strontia, p. 216. 65. On the saltpetre of commerce, p. 225. XXV. 231. 66. On the acid and ores of tin, XXIV. p. 127. 67. Extract from Nicholson, p. 156. 68. On basaltic prisms, p. 160. 69. On a micaceous ore of iron, p. 161. 70. Notes on Nicholson, p. 175. 71. On the manufactory of soap, p. 199. 72. On pumice stone, p. 200. 73. On obtaining fire and water for chemical experiments, p. 310. 74. On platina, XXV. p. 3. 75. On sugar, p. 37. 76. Note from Nicholson, p. 69. 77. On the combustion of the diamond, p. 76. 78. On alcarrazas or cooling jars, p. 167. 79. On the water of Caldas, p. 180. 80. On nomenclature, p. 205. 81. On the composition of salts, from Kirwan, with tables, p. 282, 292, 296. 82. On the conducting power of charcoal for heat, XXVI. p. 225. 83. On the action of fused nitre on gold, silver, and platina, XXVII. p. 42. 84. On tempering steel, p. 186. 85. On odorous emanations, p. 218. 86. On the precipitation of silica by lime, XXVII. p. 320. 87. On iron and cast steel, from Cloutet's experiments, XXVIII. p. 19. 88. On the natural productions of Spain, from Fernandez, p. 311. 89. On the succinic acid, XXIX. p. 161. 90. On the destruction of contagious matter, p. 209. 91. On artificial coolings, p. 291. 92. On the application of gas to wounds, p. 305. 93. On the fusibility of mixed earths, and on their mutual action, p. 320. 94. On a peculiar crystallization of quartz, XXX. p. 117. 95. On the action of metallic substances on vegetable colours, and on lacs, p. 180. 96. On the combustion of a diamond, XXXI. p. 72. 97. Notice of Reuss's mineralogical dictionary, p. 177. 98. On the affinities of the earths, p. 246. 99. Note on the silica found by Davy in the epidermis of vegetables, p. 276. 100. On the conversion of iron into cast steel by a diamond, p. 328; the diamond weighed 13 grains. 101. On the conversion of diamond into charcoal, and on the disoxygenization of sulfur, XXXII. p. 62. 102. Comparison of the French and German weights, p. 225. 103. Extract of Thenard's memoir on antimony, p. 257. 104. Chemical news, p. 328. 105. Account of Libes's theory of elasticity, XXXIII. p. 110. 106. On the colouring principle of the lapis lazuli, XXXIV. p. 54; supposed to be a sulphuret of iron combined with earth. 107. Note on adhesion, p. 199. 108. On the theory of crystallization, Journal de l'Ec. Polyt. I. p. 278. 109. Analysis of a chalcedony, p. 287. 110. On the composition and proportions of salts, M. Inst. Sc. II. p. 326. 111. On anomalies in affinities, p. 460, V. p. 55. 112. On the composition of the alkalies, III. p. 321; supposing them to contain lime. 113. On a metal proper for small coins, VII. ii. p. 80. 114. On the measurement of high temperature, and on expansion, IX. ii. p. 1; a thermometer of platina. 115. On the tenacity of ductile metals, and on the different densities of lead, X. p. 267. Extract Ann. Chim. LXXI. p. 189.—To return to the Annales de Chimie, in which he continued to be an active co-operator to the close of his life, we find a multiplicity of his essays and abstracts in the latter volumes. 116. On lime and mortar, XXXVII. p. 253. 117. Report on the tartaric acid, XXXVIII. p. 30. 118. On a lamp, p. 185. 119. On Woodhouse's opinion of phlogiston, p. 272. 120. On a cold combustion of the carbonic oxyd, XXXIX. p. 18. 121. Traité des moyens de désinfecter l’air ; Extr. Annales Chimie, XXXIX. p. 74. Dutch, by Luitschus, noticed Ann. Chim. XLVI. p. 105. 122. On the analysis and synthesis of earths, p. 171. 123. On a stove, XLII. p. 79. 124. On bell-metal, p.167. 125. On an instrument for examining gold coin, XLII. p. 23. 126. On Burkitt’s apparatus for distillation, p. 191. 127. Note on propolis, p. 195. 128. Extract from Nicholson, p. 205. 129. On Davy’s eudiometer, p. 301. 130. On some alloys of iron, XLIII. p. 47. 131. On the dilatation of gases, p. 153, 154, 156. 132. On prussic precipitates, p. 185. 133. On colethar for polishing, p. 331. 134. Extract from Nicholson, XLIV. p. 21. 135. On Mitchell’s nomenclature, p. 305. 136. On fumigation, p. 286; XLVI. p. 113; LI. p. 311; LII. p. 347; LVI. p. 103, 114; LXII. p. 113; LXVI. p. 183. 137. On a pyrometer of platina, XLVI. p. 276. 138. On a native carbonate of magnesia, XLVII. p. 85. 139. Extract of a vocabulary, p. 93. 140. Italian novelties, p. 203; XLVIII. p. 98, 186. 141. On a verifier for Louis d’ors, XLVIII. p. 291. 142. On an alloy of gold and platina, p. 300. 143. Extract from Winterl, p. 312. 144. From Chenevix on the eye, XLVIII. p. 74. 145. On a sulphate of magnesia, p. 79. 146. On a proposal for washing with sea water, p. 108. 147. Note of Hatchett’s memoir on alloys, L. p.113. 148. Extract from Christobal’s chemistry of the arts, LIII. p. 115. 149. Report on the effect of disagreeable odours on the health, LIV. p. 86; not necessarily noxious. 150. Report on chimnies, LV. p. 5. 151. On a sculptured flint, LVIII. p. 75. 152. On filtering stones, and on specific gravities, LX. p. 121. 153. Extract on Galvanism, LXI. p. 70. 154. On a supposed antique emerald, p. 260. 155. On nitrous ether, p. 282. 156. On the qualities of glass, LXII. p. 5. 157. Extract on pottery, p. 213. 158. On Galvanism, as affecting minerals, LXIII. p. 113. 159. On chimnies, LXIV. p. 113. 160. Extract on diamond, LXV. p. 84. 161. On a hygrometer for gases, LXVIII. p. 5. 162. On oxidation in a vacuum, LXIX. p. 261. 163. On carbonate of potass as a medicine, LXX. p. 32. 164. On a crystallization of the diamond, p. 60. 165. On Curaudau’s pyrotechny, LXXI. p. 70. 166. On glass making, LXXXIII. p. 113. 167. On an ore of platina from St Domingo, p. 334. 168. On pyrometry, LXXIV. p. 18, 129. 169. On potass and magnesia as medicines, LXXV. p. 204. 170. On laminated platina, LXXVII. p. 297. 171. On oxymuriatic acid as a medicine, p. 305. 172. On the effects of continued heat on pyrometrical bricks, LXXVIII. p. 73. 173. On the pseudacorus as a substitute for coffee, p. 95; LXXXVI. p. 63. 174. On coffee as a substitute for bark, LXXXVIII. p. 203. 175. Official instructions for preventing contagion, LXXXII. p. 205. 176. On a lime wash for walls, LXXXIII. p. 285. 177. On the diamond, LXXIV. p. 20, 233. 178. On the non-existence of sugar in diabetes, p. 225. 179. On an indigenous tea, p. 333. 180. On Reid’s pendulum, LXXXV. p. 183. 181. On sugar boiling, p. 192. 182. On the diamond, LXXXVI. p. 22. 183. On chemical police, p. 105; XC. p. 101. 184. On measures of zinc, LXXXVI. p. 113. 185. On a meagre lime, LXXXVIII. p. 19. 186. On biliary calculi, p. 84. 187. On the solution of calculi in the bladder, LXXXIX. p. 92. 188. On phosphorescent urine, p. 182. 189. On album græcum, p.325. 190. On pyrometry, XC. p. 113, 225. 191. On magnesia as a medicine, XCI. p. 224, 285. 192. On tempering steel, XCII. p. 85. 193. On putrefaction, p.160. 194. On poisons, from Brodie, XCIII. p. 5. 195. On the oxalic acid as a poison, p. 199. 196. On the effect of the phosphoric acid upon turmeric, XCIV. p. 223; like that of other acids. 197. On fumigations, XCV. p. 321; XCVI. p. 5. 198. On a solvent for biliary calculi, p. 103; from Durand’s paper.

(Life, by Dr Granville, Journ. R. Inst. 1817.)