Regnier de Graaf

Jan Swammerdam – Dutch Naturalist and Microscopist

Jan Swammerdam – Dutch Naturalist and Microscopist

On February 12, 1637, Dutch biologist and microscopist Jan Swammerdam was born. He was one of the first people to use the microscope in dissections, and his techniques remained useful for hundreds of years. Swammerdam’s work on insects demonstrated that the various phases during the life of an insect — egg, larva, pupa, and adult — are different forms of the same animal. In 1658, he was the first to observe and describe red…
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Regnier De Graaf – Creator of Experimental Physiology

Regnier De Graaf – Creator of Experimental Physiology

On July 30, 1641, Dutch physician and anatomist Regnier de Graaf was born. De Graaf made key discoveries in reproductive biology as e.g. he discovered the follicles of the ovary (known as Graafian follicles), in which the individual egg cells are formed (1672) and also published on male reproductive organs (1668). He was also important for his studies on pancreatic juice (1663) and on the reproductive organs of mammals. He is considered…
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