Gemma, Reinier

, sometimes called Gemma Frisius, from his country, was a Dutch physician, a native of Dockum in Friseland, who practised physic at Louvain. He was born in 1508, and died in 1555. Besides his medical skill, he was esteemed one of the best astronomers of his age; and wrote several works on that science, and other branches of mathematics, among which the principal are, “Methodus Arithmetics” “Demonstrationes Geometries? de usu radii astronomici” “De Astrolobio catholico liber,” &c. His son, Cornelius Gemma, became royal professor of medicine in his native place in 1569, through the appointment of the duke of Alba, at which time he took the degree of doctor, but a few years afterwards died of the plague, which raged at Louvain, Oct. 12, 1577. His writings are not numerous, ad relate to mathematical and philosophical subjects as well as to medicine. There was a third, John Baptist Gemma, a native of Venice, and a physician of considerable repute about the end of the fifteenth century, who was physician to Sigismund III. king of Poland. He wrote a treatise, containing a history of pestilential epidemics, with a detail of the effects of contagion, &c. printed in 1584. ²

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