Human physiology (Volume 2) . lpeaud equallythinks, that the nutriment of the ovum is derived from differentsources at different periods of intra-uterine existence. The em-bryo, he says, is at first but a vegetable, imbibing the surroundinghumours. The villi of its circumference, which are true cellularspongioles, obtain nutritive principles in the Fallopian tube andthe uterus, to keep up the development of the vesicles of the em-bryo ; after which the new being is nourished like the chick inovo, or rather like the plantule, which is, at first, altogether deve- * Embryologie, ou Essai Anatomiq
Human physiology (Volume 2) . lpeaud equallythinks, that the nutriment of the ovum is derived from differentsources at different periods of intra-uterine existence. The em-bryo, he says, is at first but a vegetable, imbibing the surroundinghumours. The villi of its circumference, which are true cellularspongioles, obtain nutritive principles in the Fallopian tube andthe uterus, to keep up the development of the vesicles of the em-bryo ; after which the new being is nourished like the chick inovo, or rather like the plantule, which is, at first, altogether deve- * Embryologie, ou Essai Anatomique sur le Fetus Humain, Paris, 1821. b Signs and Symptoms of Pregnancy, p. 133, Lond. 1837. c Physiologie de IHomme, 2de edit., iv. 397, Paris, 1829. d Embryologie ou Ovologie, &c, Paris, 1833 ; and Traite Elementaire de lArt desAccouchemens, Professor Meigss translation, 2d edit. p. 213, Philad. 1838. See alsoBroussais, Traite de Physiologie, &c.; Drs. Bell and La Roches translation 3d Ameredit. p. 535, Philad. Decidual Cotyledons. —(Montgomery.) NUTRITION OF THE FOZTUS. 457 loped at the expense of principles inclosed in its cotyledons. Itgradually exhausts the vitelline substance contained in the umbi-lical vesicle. The emulsive substance of the reticulated sac of theallantoid pouch is also gradually absorbed. The end of the secondmonth arrives ; the vessels of the cord are formed, and the pla-centa is developed ; by its contact with the uterus, this organ ob-tains reparatory materials, elaborates them, and forms from thema fluid more or less analogous to blood, and this fluid is absorbedby the radicles of the umbilical vein. We find, consequently, some of the most distinguished physiolo-gists of the age denying — as it would seem that every one oughtto deny — that the nutrition of the foetus takes place solely bymeans of blood sent by the mother to the foetus. If we search intothe evidence afforded us by transcendental anatomy, we find thatamidst the various sin
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