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[viii], 459 pp. 34 engraved plates, all but one folding; more than 260 geometrical figures in text. (4to) 24.5x19.5 cm (9½x7½") early half calf and marbled boards, morocco spine label lettered in gilt. Early Edition.

First published in 1707 from a manuscript L’Hospital had left at his death in 1704, this is one of the first works in which algebra is applied to geometrical questions. Montucla considered this work a “Monument of Science.” L'Hospital was a major figure in the early development of the calculus on the continent of Europe. He advanced its cause not only by his scientific works but also by his many contacts, including correspondence with Leibnitz, Bernouilli and with Chr. Huygens. Fontenelle tells us that it was L’Hospital who introduced Huygens to the new calculus. Poggendorf I, 1146; DSB VIII, p. 304-5.