PETER, a learned physician, was the son of James Borel who published several poems, and was born at Castres in 1620. He applied himself to the study of physic, of which he was created doctor, and practised with great success in the city of Castres. To- wards 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 medico-physicarum centuria quingue. 2. Bibliotheca chymica, duodecimo. 3. De vero telescopii inventore, cum brevi omnium conspiscillorum historia. He died in 1678.