ADRIAN, an eminent mathematician, was the son of a military engineer, and was born at Alkmaar in Holland in 1571. He studied practical mathematics under his father, law and medicine at the university of Franeker, and astronomy under Tycho Brahe. After visiting Germany, and delivering astronomical lectures there with great success, he returned to Holland to assist his father in his official duties. In 1598 he was promoted to the chair of mathematics at Franeker, a position which he held during the remainder of his life. The degree of M.D. was conferred upon him in 1625. Much of his time and money was latterly spent in the fruitless researches of alchemy. Metius died in 1635. The following is a list of his works:**

- **Doctrina Sphaericae, 8vo, Franeker, 1598; Universae Astronomiae Institutio, 8vo, Franeker, 1606; Arithmeticae libri duo, et Geometriae libri sex Practice, 4to, Franeker, 1611; Praxis Nova Geometrica per usum circuli et regula proportionalis, 4to, Franeker, 1623; De Gemina Usu utrinque Globi, 4to, Amsterdam, 1611; Problematum Astronomico Geometricae Delineata, 4to, Leyden, 1625; Astralabium, 8vo, Franeker, 1626; Calendarium Perpetuum Articulis Digitorum Computandum, 8vo, Rotterdam, 1627; and Opera Omnia Astronomica, 4to, Amsterdam, 1633.**