. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. RKPRODUCTION. 55 the influence genesis are to lich form the specialized to t wholly lost »boids, as we avior, nor do all retain the in young and production of mature ones, fected by the juilar forms. Is an army of ,ir tiusues lost uic condition; re of this un- {ovum) from ts complexity )ermatozoSn), unspecialized ve functions. ?he germ-cell Functions, but igly great ca- »into acc
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. RKPRODUCTION. 55 the influence genesis are to lich form the specialized to t wholly lost »boids, as we avior, nor do all retain the in young and production of mature ones, fected by the juilar forms. Is an army of ,ir tiusues lost uic condition; re of this un- {ovum) from ts complexity )ermatozoSn), unspecialized ve functions. ?he germ-cell Functions, but igly great ca- »into account g this it must division each n ; that is to ess in turn as he OTum is a ial, of cours*^, id unexpected }gical energy which in sim- events which a may be ex- a of potential iewed chemi- n of forms, of ble and com- plex ones, involving throughout the process of oxidation ; for it must ever be kept in mind that life and oxidation are con- comitant and inseparable. The further study of reproduction in the concrete will render the meaning and force of many of the above statements clearer. THB OVX7M. The typical female cell, or ovum, consists of a mass of pro- toplasm, usually globular in form, containing a nucleus and nucleolus. , The ovum may or may not be invested by a membrane; the protoplasm of the body of the cell is usually highly granular, and may have stored up within it a varying amount of proteid material (food-yelk), which has led to division of ova mto classes, according to the manner of distribution of this nutri- tive reserve. It is either concentrated at one pole (telolecith- at); toward the center (centrolecithat); ct evenly distributed throughout {alecithal). During development this ^ material is converted by -^-^ the agency of the cells of the young organism {em- bryo) into active proto- plasm ; in a word, they feed upon and assimilate or build up this food-stuff into their own substance, as Amoeba does with any proteid material it appro- priates. The nuc
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