. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ng oharac- ira are thu e this, falls [)articles of their own superficial f decompo- hemselyes. to living material in iliar. Car- into a very Q oombina- basis of all )nly living nn. is continu- ilt up from riable prod- the carbon, k to the in- than those be evident is constant tntinuously life, trans- xistence in I originally 1 organized forms; but [ the atmoB- li. ring things
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. ng oharac- ira are thu e this, falls [)articles of their own superficial f decompo- hemselyes. to living material in iliar. Car- into a very Q oombina- basis of all )nly living nn. is continu- ilt up from riable prod- the carbon, k to the in- than those be evident is constant tntinuously life, trans- xistence in I originally 1 organized forms; but [ the atmoB- li. ring things nited dura- â ank-in the through a and finally >ins the in- to which ii GENERAL BIOLOGY. 8 Living things alone give rise to living things ; protoplasm alone can beget protoplasm ; cell begeto cell. Omne animal (anima, life) ex ovo applies with a wide interppjtation to all living forms. From what has been said it will appear that life is a condi- tion of ceaseless change. Many of the movements of tht priP toplasm composing the cell-units of which living beings are made are visible under the microscope; their united effects are open to common observationâas, for example, in the move- ments of animals giving rise to locomotion we have the joint result of the movementa of the protoplasm composing millions of muscle-cells. But, beyond the powers of any microscope that has been or probably ever will be invented, there are molecular movements, ceaseless as the flow of time itself. All the pro- cesses which make up .the life-history of organisms involve this molecular motion. The ebb and flow of the tide may symboluw the influx and eiflux of the things that belong to the inanimate world, into and out of the things that live. It follows from this essential instability in living forms that life must involve a constant struggle against forces that tend to destroy it; at best this contest is maintained successfully for but a few years in all the highest grades of being. So long
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