. Un libro di testo di fisiologia comparativa [microformati] : per gli studenti e gli operatori di confronto (veterinario) medicina. Fisiologia, confronto; Fisiologia Veterinaria; Physiologie comparée; Physiologie veterinaria. Iet il corpo dell uomo natura superiore , sviluppo; , occorre considerare che aent dei poteri m in scala, le sue tende ad in- i, e deve, se f animali e lancia a se stesso, l'accumulo di variazioni oup è contrassegnato persistono, il diritto di riproduzione.. Come è già stato notato, protoplasma sotto qualsiasi forma, dopo il passaggio attraverso alcune fasi di sviluppo, subisce un declino e infine muore e

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. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. Eit man's body higher nature , development; , consider that aent of powers m in the scale, its tends to in- i, and must, if f animals and lance to itself, The variations accumulation oup is marked persist, the law REPRODUCTION.. As has been already noticed, protoplasm, in whatever form, after passing through certain stages in development, undergoes a decline, and finally dies and joins the world of unorganized matter ; so that the permanence of living things demands the constant formation of new individuals. Groups of animals and plants from time to time become extinct; but the lifetime of the species is always long compared with that of the indi- vidual. Reproduction by division seems to arise from an exi- gency of a nutritive kind, best exemplified in the simpler or- ganisms. When the total mass becomes too great to be supported by absorption of pabulum from without by the surface of the body, division of the organism must take place, or death ensues. It appears to be a matter of indifference how this is accom- plished, whether by fission, endogenous division, or gemmation, so long as separate portions of protoplasm result, capable of leading an independent existence. The very undifferentiated character of these simple forms prepares us to understand how each fragment may go through the same cycle of changes as the parent form. In such cases, speaking generally, a million individuals tell the same biological story as one; yet these must exist as individuals, if at all, and not in one great united mass. But in the case of conjugation, which takes place some- times in the same groups as also multiply by division in its various forms, there is plainly an entirely new aspect of the case presented. We have already shown that no two cells, how- ever muc

Parole chiave associate all'immagine

• bookauthormillswes
• bookcentury1800
• bookdecade1890
• bookyear1890