. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 7' 'M 84 COMPARATIVE PIIV8I0L00Y. waUshwi were beyond obMnmUon, we should not be able to atat* exactly how the variationa obaerred in different kindii, or even different individual* of tho lame kind occurred, though thew differenoea might be of the moat marked character, luch oa any one could recogniie. Here once niorr* we refer the differ- ences to the mechaniani. 80 ii it with
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 7' 'M 84 COMPARATIVE PIIV8I0L00Y. waUshwi were beyond obMnmUon, we should not be able to atat* exactly how the variationa obaerred in different kindii, or even different individual* of tho lame kind occurred, though thew differenoea might be of the moat marked character, luch oa any one could recogniie. Here once niorr* we refer the differ- ences to the mechaniani. 80 ii it with living beings : the ulti- nwte molecular mechanism is unknown to us. Could we but render these molecular movementa risible to our eyes, we should have a revelation of far greater scientific importance than that unfolded by the recent researches into those living forms of extreme minuteness that swarm every- where as dust in a sunbeam, and, as will be learned later, are often the source of deadly disease. Like the movements of the watch, the activities of protoplasm are ceaseless. A watch that will not run is, as such, worthless—it is mere metal—has under- gone an immense degradation in the scale of values ; ho proto- plasm is no longer protoplasm when its peculiar molecular movements cease; it u at once degraded to the rank of dead matter. The student may observe that each of the four propositions, embodying the fundamental properties of living matter, stated in the preceding chapter, have been illtistrated by the simile of a watch. Such an illustration is necessarily crude, but it helps one to realize the meaning of truths which gather force with each living form studied if regarded aright; and it is upon the realization of truth that mental growth ai well as practical efficiency depends. OZJUWIFIOATIOM OP THB AMIMAL XZNODOIC There are human beings so low in the scale as not to possess such general terms as tree, while tliey do employ names for dif- ferent kinds of tree
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