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Show 216 MR. J. B. SUTTON ON DISEASES IN MAMMALS. [Apr. 20, carrying with it, the ileo-csecal valve (see fig. 9, p. 217). The invaginated portion measures two and a half inches. The portion of gut above the constricted portion was very congested and almost gangrenous. The intussusception was very acute, and probably killed the animal, a Lemur, very quickly. The case is further interesting, for the intussusception occurred at that part of the intestine which Fig. 8. The marsupium of a Short-headed 1'halanger, Belideus breviceps, opened in order to show a scirrhous cancer growing from the mammary gland. The microscopic characters of the growth are shown in figure B. is most frequently affected in this way in the human subject; but it is an example of the rarer form that occurs in this situation, viz. the ileo-csecal variety. The investigation into disease, structural aberrations, and malformations of animals is of considerable importance apart from its intrinsic interest. Darwin, in his ' Descent of Man,' 2nd ed., 1874, page 6, writes : - " Man is liable to receive from the lower animals, and to communicate to them, certain diseases, as hydrophobia, variola, glanders, syphilis, cholera, herpes, etc. ; and this fact proves the close similarity of their tissues and blood, both in minute structure and composition, far more plainly than does their comparison under the best microscope or by the aid of the best chemical analysis." He then quotes Rengger to the effect that the Cebus azarce in its native land is liable to catarrh, apoplexy, inflammation of the bowels, and cataract. This quotation seems to indicate beyond doubt that, had sufficient evidence been forthcoming regarding diseases of animals, Darwin |