BARTHOLINUS (Thomas), a celebrated physician, son of the former, was born at Copenhagen in 1616. After studying some years in his own country, he in 1637 went to Leyden, where he studied physic during three years. He then travelled into France; and resided two years at Paris and Montpellier, in order to improve himself under the famous physicians of those universities. Afterwards going to Italy, he continued three years at Padua; and at length went to Basil, where he obtained the degree of doctor of philosophy. Soon after, he returned to Copenhagen; where, in 1647, he was appointed professor of the mathematics; and next year was nominated to the anatomical chair, an employment better suited to his genius and inclination; which he discharged with great assiduity for 13 years, and distinguished himself by making several discoveries with respect to the lacteal veins and lymphatic vessels. His close application, however, having rendered his constitution very infirm, he, in 1661, resigned his chair; but the king of Denmark allowed him the title of honorary professor. He now retired to a little estate he had purchased at Hagested, near Copenhagen, where he hoped to have spent the remainder of his days in peace and tranquillity; but his house being burnt in 1650, his library, with all his books and manuscripts, was destroyed. In consideration of this loss the king appointed him his physician, with a handsome salary, and exempted his land from all taxes; the university of Copenhagen also appointed him their librarian; and, in 1675, the king did him the honour to give him a seat in the grand council of Denmark. He wrote, 1. Anatomia Caspari Bartholini Parentis novis Observationibus primum locupletata, 8vo. 2. De Monstris in Natura & Medicina, 4to. 3. De Armillis Veterum, praesertim Danorum Schedion, 8vo; and several other works. This great man died on the 4th of December 1680.