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  "text": "when those Fumes were pass'd, and the Receiver grew clear, they were after a while succeeded by another sort that seem'd in the Receiver to give a faint blewish Light, almost like that of little burning Matches dipt in Sulphur. And last of all, the Fire being very vehement, there pass'd over another Substance, that was judg'd more ponderous than the former, because it fell through the Water to the bottom of the Receiver; whence being taken out, (and partly even whilst it stay'd there, it) appeared by several Effects, and other Phænomena, to be such a kind of Substance as we desired and expected.\n\nII. Problema Florentinum, de mira Templi Testudine Quadrabili. A Doctissimo Dno. Johanne Wallis, S. T. D. Solutum.\n\nIbet hic subjungere, Problema quoddam (interven- tu Clarissimi Viri D. Guilielmi Bridgman) ad me transmissum, de mira cujusdam Templi Testudine Quadrabili, meamque ejusdem Solutionem, cum subjuncto Scholio eam explicante.\n\nD. Guilielmi Bridgman ad me Epistola, erat (Latine reddita) ad hunc fenulum;\n\nReverendo Viro, D. Wallis S. T. D. Geometriae Professori, Oxonii.\n\nAugusti 30. 1692.\n\nInclusam churtulam (Reverende Vir) Florentia mibi missam, ut ad te deferatur (de qua sententiam tuam expe-\ntunt) cum bis accipies. Cui si tibi visum fuerit responsi\naliquid reponere, id ego curabo Florentiam remittendum.\n\nTuus ad officia,\n\nGuilielmus Bridgeman.\n\nInclusa chartula, hæc erat.\n\nDie 4. April. 1692.\n\n\"ÆNIGMA GEOMETRICUM\n\"DE MIRO OPIFICIO TESTUDINIS\n\"QUADRABILIS HEMISPHERICA\n\"A\n\"D. PIO LISCI PUSILLO GEOMETRA\n\n\"Propositum.\n\n\"Cujus Divinatio, à secretis Artibus Illustrium Anz-\n\"lystarum vigentis ævi expectatur, quod, in Geometriae\n\"pura historia tantummodo versatus, ad tam recondita\n\"videatur invalidus.\n\n\"Inter venerabilia eruditæ olim Graeciae monumen-\n\"ta, extat adhuc, perpetuo equidem duraturum,\n\"Templum augustissimum, ichnographia Circulari,\n\"ALMÆ GEOMETRIÆ dicatum, quod, à Testudine\n\"intus perfecte hemisphærica, operitur: sed in hac,\n\"fenestrarum quatuor æquales areae (circum, & supra\n\"basim hemisphærae ipsius dispositarum) tali configura-\n\"tione, amplitudine, tantaque industria, ac ingenii acu-\n\"mine sunt extructæ, ut, his detractis, superstes curva\n\"Testudinis superficies, pretiosò opere masivo ornata,\n\"Tetragonismi verè Geometrici est capax.\n\"Quæritur modo, quæ sit, qua methodo, quæve\n\"arte, pars illa hemisphæricae superficiæ curvæ quadra-\n\nbilis.\nbilis, tensae ad instar Carbasi, vel turgidi Veli nautici,\nab Architecto illo Geometra fuerit affecta? & cui de-\nmum plano geometricce quadribili sit æqualis.\n\nPræsentis Ænigmatis enodatio (quod spectat ad\nhujus admirabilis Fornicis, tum Constructio-\nnem expeditissimam, tum Quadraturam) SERENIS-\nSIMO FERDINANDO MAGNO PRINCIPI ETRU-\nRIÆ, Scientiarum, & nobiliorum Artium CULTO-\nRI, ac PATRONO GENEROSISSIMO, ab eodem\nÆnigmatista collata jam est; qui quidem simul non\ndubitat quin hoc ipsum Ænigma à singulis, literario in\nOrbe degentibus hodie, præclarissimis Analystis, sit\nstatim divinaturum, proprias quadrationes impertien-\ndo singularis Testudinis hujus tetragonismicæ ac hemi-\nspæra disjectæ: sed ipsorum solummodo percutas\nindagines, multiplicesque industrias ad hoc unum, i-\ndemque Geometricum collimantes, impatientur expe-\netat, ut hinc, qui temere contumelias in Geometriam\njacere audent, filere discant; vel potius maxima cum\nvoce exclament. OH UNICA VERORUM SCIS-\nCITABILIUM SCIENTIA à DIVINA in Hominem\nMENTE infusa, ut haec, imperviis, mutabilibus, fallaci-\nbusque contemptis, æterna ista, quæ semper, & uni-\ncuique sunt eadem, tantum appetat, nilque aliud un-\nquam magis innocuum scire perquirat.\n\nCui sic responsum est.\n\nClarissimo",
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    "title": "Problema Florentinnm, de Mira Templi Testudine Quadrabili. A Doctissimo Dno. Johanne Wallis, S. T. D. Solutum",
    "authors": "Johanne Wallis",
    "year": 1693,
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