Johannes Walaeus

Johannes Walaeus, born Jan de Wale and also known as Johannes de Wale (1604 to 1649), was a Dutch physician and an illustrious professor at the Faculty of Medicine of Leiden University. He took his doctorate in medicine in 1631, defending a dissertation entitled Disputatio medica de febribus at Leiden. Two years later he was nominated professor extraordinarius, and in 1648 he was offered a full professorship at Leiden University. He was the son of the theologian Antonius Walaeus. His writings include two letters on the motion of the chyle and of the blood, Epistulae duae: De motu chyli, et sanguinis, which were published in 1677 after his death in 1649.