XXXV111 CONTENTS. 



Nutrition in the carnivora the most simple 



In the herbivora, depends on the azotized products of veg- 

 etables ......... 



These products identical with the constituents of blood 



The blood of animals is therefore formed by vegetables . 



Uses of the non-azotized ingredients of food 



Changes of the food in the organism of carnivora . 



Carbon accumulates in the bile 



Nitrogen in the urine 



The carbon is consumed or burned . . . . 



True function of the bile 



Amount of bile secreted ....... 



Assimilation more energetic in the young animal . 



The butter, sugar, &c., of its food support respiration 



The same is true of the class of herbivora 



Waste of matter very rapid in carnivora .... 



Importance of agriculture to population .... 



Assimilation less energetic in the carnivora 



Origin of fat in domesticated animals .... 



Its formation is a source of oxygen . . . . 



It is formed when oxygen is deficient, and is a source of 

 animal heat 86 



Elements of nutrition and of respiration . . 92 



<5elatine incapable of serving for nutrition, strictly so called 93 



But it may serve to nourish the gelatinous tissues . . 94 



PART II. 

 THE METAMORPHOSIS OF TISSUES. 



Discovery of proteine 10] 



It is formed by vegetables alone 102 



Theory of chymification 104 



Uses of the saliva 108 



