. 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. lay "be ex- potential chemic- forms, of and com- on; for it concomi- Ition in the Lny of the 38 of proto- ns and nu- brane; the Y granular, i of proteid F ova into this nutri- {telolecith- distributed iaZ). Dur- lis material B agency of ung organ- active pro- I, they feed te or b
. 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. lay "be ex- potential chemic- forms, of and com- on; for it concomi- Ition in the Lny of the 38 of proto- ns and nu- brane; the Y granular, i of proteid F ova into this nutri- {telolecith- distributed iaZ). Dur- lis material B agency of ung organ- active pro- I, they feed te or build into their .moeba does material it Tninal vesi- 'ell-defined, in itself a nucleolus lese closely the rest of different in sential par- BEPRODUCTION. 55. Fio. SO.âA huniAii egg (much enUrged) from the oTarjr of a female. The whole egir !â ⢠simple mhericsl cell. The creMer part of this cell to formed by the egg-yttk, by the gran- ular cell-aubatance (pmtoplaam), oonatoting of Innumerable yelk-granule« with a little inter-eranuUr subetance. In the upper part of the yelk Ilea the briffht, elobular, germ- veeiole. comapondiog with the cell-kernel (nueteiu). Thto containa a darker geniMpot. anaweHng to the nucleolus. The Klobular yelk-nuMs to mnroundrd by a thick, light- colored eKK-membrane (tona pettueuia, or chorion). Thto to traversed by Tery numeroua hair-like lines, radiating toward the central point of the maas: these are the porous canals, through which, in the course of fertHiiatlon, the thread-shaped, active sperm-ceUs penetrate hito the egg-yelk. (HaeckeL) ticular of structure from other cells. Its differences are hidden ones of molecular structure and functional behavior. In ac- cordance with the diverse circumstances under which ova mature and develop, certain variations in structure, mostly of the nature of additions, present themselves. Thus, ova may be naked, or provided with one or more coverings. In vertebrates there are usually two membranes aro
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Keywords: ., bookauthormillswes, bookcentury1800, bookdecade1880, bookyear1889
