In the course of his anatomical researches he made many discoveries and gave to parts of the human body names which remain in common use to this day. Dr. Baas thus sums up his anatomical and physiological knowledge. He knew the nerves, that they had a capacity for sensation, and were subject to the will, were derived from the brain, in which he discovered the calamus scriptorius, the tela choroidea, the venous sinuses, and torcular Herophili. He believed the fourth ventricle to be the seat of the soul. He discovered the chyliferous and lactiferous vessels. He described accurately the liver and Fallopian tubes, the epididymis and the duodenum, to which he gave its name, and also the os hyoides, the uvea, the vitreous humour, the retina, and the ciliary processes. He called the pulmonary artery the vena arteriosa, and the pulmonary vein the arteria venosa. He distinguished in respiration a systole, a diastole, and a period of rest. He founded the doctrine of the pulse, its rhythm, the bounding pulse and its varieties according to age. The pulse is communicated by the heart to the walls of the arteries. He distinguished between arteries and veins, and admitted that the arteries contain blood. He taught that diseases are caused by a corruption of the humours. Paralysis is due to a lack of nerve influence. He laid great stress upon diet, bled frequently, and practised ligation of the limbs to arrest bleeding. He was the first to administer cooking salt as a medicine. A good botanist, he preferred vegetable remedies, which he termed the “Hands of the gods.” He possessed considerable acquaintance with obstetric operations,[412] and wrote a text-book of midwifery.[413] ERASISTRATUS, of Iulis in the island of Cos, a pupil of CHRYSIPPUS was one of the most famous physicians and anatomists of the Alexandrian school. Plutarch says that when he was physician to King Seleucus, he discovered that the young prince Antiochus had fallen in love with his step-mother Stratonice by finding no physical cause for the illness from which he was suffering, and that his heart palpitated, he trembled, blushed, and perspired when the lady entered the room. By adroit management he induced the king to confer on the prince the object of the young man’s passion. _Similia similibus curantur._ So successful was the treatment that the physician received a fee of 100 talents, which supposing the Attic standard to be meant would amount to £24,375, perhaps the largest medical fee on record.[414] He lived for some time in Alexandria, and gave up medical practice in his old age, that he might devote his whole time to the study of anatomy.