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Rh Simon L'Huillier, for many years Professor of Mathematics at Geneva, was born in that city on the S^th of April, 1750. The rapid progress which he made in his collegiate studies was viewed with so much interest by one of his relations, a minister of the reformed church of Geneva, that he bequeathed him a large portion of his fortune, on the express condition that he would embrace the cleri- cal profession : but young I'Huillier, feeling no inclination to the studies which this condition would have imposed upon him, resisted the temptation, and preferred devoting himself to the pursuits of abstract science. The spirit of independence evinced by this sacri- fice, together with the extraordinary aptitude he displayed for mathe- matical acquirements, excited the interest and conciliated the affec- tion of another of his relations, the celebrated Le Sage, by whose instructions and counsels the most salutary influence was exercised over the studies of his pupil. Bertrand, who then occupied the chair of Mathematics in the same college, was also one of those who discerned in I'Huillier the dawn of genius ; and even at that early period he regarded him as destined to be his successor in that pro- fessorship.

As I'Huillier advanced to manhood, it became necessary for him to engage in some active employment, in which he could turn to account his academical attainments. He had the good fortune, at this critical time of his life, to be chosen tutor to Prince Czarto- rynski, with whom he remained for a period of thirteen or fourteen years ; ever honoured with the friendship and respect of all the mem- bers of the Prince's family. He dedicated to the father of his pupil his first work, which was published at Warsaw in 1782, under the title of De relatione mutud capacitatis et terminorum Jigurarum,

juxta methodi naturalis normas digesta : partes I. — IV. 8vo. Parisiis, 1824 —1830.

5. M^moire sur la famille des Legumineuses ; 4to. Paris, 1825.

6. Plantes rares du Jardin de Geneve ; livraisons I. — III. ; 4to. Geneve, 1826.

7. Organographie Vegetale, ou Description raisonnee des plantes ; 2 vols. 8vo. Paris, 1827. (This work has been translated into German by Meissner, in 1828.)

8. Collection de memoires pour servir a I'histoire du Regne Vegetal : 1°. Memoire sur la famille de Melastomacees ; 2°. Memoire sur la famille des Crassulacees : 2 vols. 4to. Paris, 1828.

9. Memoire sur la famille des Ombelliferes ; 4to. Paris, 1829.

10. Memoire sur la famille des Onagraires ; 4to. Paris, 1829.

11. Memoire sur la famille des Lorantliacees ; 4to. Paris, 1830.

12. Memoire sur la famille des Valerianees; 4to. Paris, 1832.

13. Cours de Botanique ; seconde partie. Physiologie Vegetale pour servir de suite a I'Organographie Vegetale, et d'introduction a la Botanique Geographique et Agricole; vol. i. — iii. ; 8vo. Paris, 1832.

De Candolle was also the author of an essay on Geographical Botany, prefixed to the second volume of the 'Flore Fran9ais6' (1805). — Of the article "Geographic botanique et agricole," in the ' Dictionnaire d'Agri- culture,' published in 1809. — Of the article " Geographie botanique," in the ' Dictionnaire des Sciences Naturelles,' 1820. — And of the article " Phy- tographie," in the 'Dictionnaire classique d'histoire naturelle.'