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Count d'Ansembray, a French nobleman, was born at Paris in 1678. During

, Count d'Ansembray, a French nobleman, was born at Paris in 1678. During his education he discovered an inclination for mathematical pursuits, and was instructed in the philosophy of Des Cartes. After this he increased his knowledge by an acquaintance with Huygens, Ruysh, Boerhaave, and other eminent men of the time. On his return from his travels he was appointed director-general of the posts in France; but, coming into possession of a country-seat at Bercy, by the death of his father, he collected a museum there furnished with philosophical and mechanical instruments, and machines of every description, which attracted the attention of the learned, and was visited by Peter the Great, the emperor of Germany, and other princes. In the Transactions of the Academy of Sciences, of which he was a member, there are several of his papers; among which is a description of an “Instrument for the Measurement of Liquids” of“An Areometer, or Wind Gage” and of a “Machine for beating regular Time in Music.” He died in 1753, bequeathing his valuable museum to the academy.