. Un texte-livre de physiologie animale [microforme] : avec des chapitres d'introduction sur la biologie générale et un traitement complet de reproduction, pour les étudiants des droits de l'homme et la médecine vétérinaire (comparative) et de biologie générale. La Physiologie, physiologie vétérinaire ; comparatifs ; physiologie comparée ; physiologie vétérinaire. 90 physiologie animale. dans la segmentation holoblastique (complètement), et ceux qui les sous- rendez-vous de segmentation qu'une partie de leur substance (meroblastic) ; mais les processus sont fondamentalement les mêmes. Il est prévu que l'alimentation, etc., de l'ovule fécondé (oosperm, quand) par le fo

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. A text-book of animal physiology [microform] : with introductory chapters on general biology and a full treatment of reproduction, for students of human and comparative (veterinary) medicine and of general biology. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 90 ANIMAL PHYSIOLOGY. into completely segmenting (holoblastic), and those that under- go segmentation of only a part of their substance (meroblastic); but the processes are fundamentally the same. Provision is made for the nutrition, etc., of the ovum, when fertilized (oosperm) by the formation of yelk-sac and allan- tois; as development proceeds, one becomes more promiiient than the other. The allantois may fuse with adjacent mem- branes and form at one part a condensed and hypertrophied chorion (placenta), with corresponding atrophy elsewhere. The arrangement of the placenta varies in different groups of ani- mals so constantly as to furnish a basis for classification. What- ever the variations in the structure of the placenta, it is always highly vascular; its parts consist of villi fitting into crypts in the maternal uterine membrane—both the villi and the crypts being provided with capillaries supported by a connective-tissue matrix covered externally by epithelium. The placenta in its different forms would appear to have been evolved from the diffuse type. The peculiarities of the embryonic membranes in birds are owing to the presence of a large food-yelk, egg-shell, and egg- membranes ; but throughout, vertebrates follow in a common line of development, the differences which separate them into smaller and smaller groups appearing later and later. The same may be said of the animal kingdom as a whole. This seems to point clearly to a common origin with gradual diver- gence of type. THE DEVELOPMENT OF THE EMBRYO ITSELF. We now turn to the development of the body of the animal for which the structures we have been describing exist. It is important, ho

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• bookyear1889