. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 444 COMPARATIVE PHYSIOLOGY. If the amount of heat that a b' > will produce in its oom- buation be known, then by the law of the oonvenion uid equiv- alence of energy the mechanical equivalent can be estimated in that particular caae. The heat-producing power of different substances can be diractly learned by ascertaining the extent to which, when fully burned (to water and car
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. 444 COMPARATIVE PHYSIOLOGY. If the amount of heat that a b' > will produce in its oom- buation be known, then by the law of the oonvenion uid equiv- alence of energy the mechanical equivalent can be estimated in that particular caae. The heat-producing power of different substances can be diractly learned by ascertaining the extent to which, when fully burned (to water and carbonic anhydride), they eleyate the temperature to a given volume of water; and this can at once be translated into its mechanical equivalent of work, so that we may say that one gramme of dry proteid would give rise to a certain number of gramme-degrees of heat or kilogramme- metrea of work. A few Bgures will now show the relative values of certain food-stuffs: 1 gramme proteid 1 gramme Available energy of the proteid ;leK. 8,106 785 Kttomet 2,161 811 1,800 The reason of the subtraction has been explained above. Taking another diet in regard to which the estimates differ somewhat from those given previously, but convenient now as showing how equal weights of substances produce very dif- ferent amounts of energy, we find that— Onun.'-dec. Kflomet. IflO cniimmeg nroteid vield 486,800 006,000 088,880 188,000 1(10 rTAfnmes lat vield 884,100 9in stiimh vield 807,680 Total 3,381,880 066,780 In other words nearly a million kilogramme-metres of en- ergy are available from the above diet for one day, provided it be all oxidized in the body. Food-stuffs, thee, with the oxygen of the air, are the body's sources of energy. What are the forms in which its expendi- turo aiHiiearB ? We may answer at once heat and mechanical •waA; for it is assumed that internal movements as Uiose of the visoenk, and all the friction of the body, all its molcular moticni, al
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