the rational, which resides in the brain. He divided diseases of the solids of the body into what he called distempers; he distinguished between the continued and intermittent fevers, regarding the quotidian as being caused by phlegm, the tertian as due to yellow bile, and the quartan as due to atrabile. In the doctrine of coction, crises, and critical days he agreed with Hippocrates; with him he also agreed in the positive statement that diseases are cured by their contraries. From all this it will be seen that Galen must be regarded as one of the earliest of Hippocratic dogmatists. He was a most extensive writer, and it is said that the total number of his works exceeded one hundred. His contributions to anatomy were not insignificant. For myology he did a great deal. He wrote a monograph on the skeleton in which he recommended that bones be seen and handled, not merely studied from books, and that the student should go to Alexandria, where teachers would place before him the real human skeleton. It has been inferred that there was not, in his time, in Rome a single skeleton. He wrote fifteen books on anatomy, of which six are lacking; also an extensive treatise on the lesions of the human body, distributed among seventeen books which have come down to us. He is supposed to have introduced the term "symphysis," and he described nearly every bone in the human body. By him the muscles were no longer considered as inert masses and tissue-layers{040} serving to cover the bones, but he classified them according to their distinct functions, and studied separately their form and uses. The location of the vessels and nerves between them was also noted, and it was proved that muscles were indispensable to the accomplishment of voluntary motions. Galen was, perhaps, the first vivisector of all, since he exposed muscles of living animals, and showed how alternate tension and relaxation of distinct groups set the bones in motion, after the manner of levers; he named a great number of them, but, curiously, took no note of others. His classification according to their uses is followed down to the present day--i.e., flexors, extensors, etc.