(Hieronymus David), a celebrated physician of Holland. He studied under the illustrious Boerhaave; and became so much the favourite of his professor, that he resigned the chemical chair in his favour. He taught at Leyden with great applause for 40 years. In the year 1775 he laid down his office, as being no longer able to support the fatigues of it. He was succeeded by John David Hahn, then professor at Utrecht. His reputation was extended all over Europe by several valuable publications, particularly by his Institutiones Pathologiae Medicinalis, and his Adversaria, which have contributed not a little to the improvement both of the theory and practice of medicine. He died at Leyden 29th November 1780, in the 76th year of his age.