. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. FUNCTIONS OF THE BltAIN. 815 body it may be made to leap; when placed on its back it regains its normal attitude. When placed on an inclined plane it crawls up until it gains a new position, and if such an experiment be made by placing a frog on a small piece of board, by gradually inclining the board more and more the frog may be made to climb up the board, pass over to the other side, and the piece of wood may be turned over a number of times the frog always moving with it as long as its equilibrium is d
. The physiology of domestic animals ... Physiology, Comparative; Veterinary physiology. FUNCTIONS OF THE BltAIN. 815 body it may be made to leap; when placed on its back it regains its normal attitude. When placed on an inclined plane it crawls up until it gains a new position, and if such an experiment be made by placing a frog on a small piece of board, by gradually inclining the board more and more the frog may be made to climb up the board, pass over to the other side, and the piece of wood may be turned over a number of times the frog always moving with it as long as its equilibrium is dis- turbed. Such a frog will likewise be apparently sensible to light, and if made to jump will avoid objects casting a strong shadow. Such move- ments as above described are evidently carried out by co-ordinating mechanisms and governed by definite afferent impulses (Figs. 355 and 356). It is evident, from the existence of these motions in the frog deprived of its cerebral hemispheres, that the mechanism governing them must lie in parts of the central nervous system below the line of section. No such operations can be effected in a frog in which the medulla has been removed. It follows, therefore, that in the medulla, or perhaps in the corpora quadrigemina and optic lobes, are found the co-ordinating centres of the most complex muscular 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 Smith, Robert Meade, 1854-. Chicago, A. Eger
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