. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE BRAIN. 513 dulla may be regarded in some sense as the oldest (phylogeneti- cally) part of the brain. In it are lodged those cells (centers) which are required for th§ maintenance of the functions essen- tial to somatic life. This may serve to explain how it is that so many centers are there crowded together. It is remarkable that so small a part of the brain should preside over many im- portant functions ; but the principle of concentration with pro- gressiv
. A text-book of comparative physiology for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative. THE BRAIN. 513 dulla may be regarded in some sense as the oldest (phylogeneti- cally) part of the brain. In it are lodged those cells (centers) which are required for th§ maintenance of the functions essen- tial to somatic life. This may serve to explain how it is that so many centers are there crowded together. It is remarkable that so small a part of the brain should preside over many im- portant functions ; but the principle of concentration with pro- gressive development, and the law of habit making automatism prominent, throw some light upon these facts, and especially the one otherwise not easy to understand, that so much impor- tant work should be done by relatively so few cells. Possibly, however, if localization is established as fully as it may eventu- ally be, this also will not be so astonishing. The law of habit has, in connection with our psychic life and that of other mammals, some of its most striking develop- ments. This has long been recognized, though that the same law is of universal application to the functions of the body has as yet received but the scantiest acknowledgment. We shall not dwell upon the subject beyond stating that in our opinion the psychic life of animals can be but indifferently understood unless this great factor is taken into the account ; and when it is, much that is apparently quite inexplicable be- comes plain. That anything that has, happened once any- where in the vital economy is liable to repetition under a. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Mills, Wesley, 1847-1915. New York, Appleton
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