(Peter), a learned physician, was the son of James Borel who published several poems, and was born at Castris in 1620. He applied himself to the study of physic, of which he was created doctor, and practiced with great success in the city of Castris. Towards the end of the year 1653, he went to Paris, and was soon after made physician in ordinary to the king. In 1674, he was received into the academy of sciences, and distinguished himself by writing a great number of works. The most esteemed are: 1. Historiarum et observationum medicæ-physicarum. 2. Bibliotheca Chymica, duodecim. 3. De vero teleopii inventore, cum brevi omnium conspicillorum historia. He died in 1678.