CONTENTS. XXXIX 



Source of the nitrogen exhaled from the lungs and skin . 109 



Composition of proteine 116 



Composition of the animal tissues 120 



Gelatine contains no proteine, although formed from it 122 

 The secretions contain all the elements of the blood . 126 

 Formula of blood and metamorphoses of bile . . 127 

 Metamorphoses of blood and flesh . . . . 130 

 The constituents of the urine derived from the metamor- 

 phosed tissues 131 



Relation of blood or flesh and proteine to the secretions 



and excretions 133 



Formation of gelatine ....... 135 



Origin of bile in the carnivora . . ... . 137 



Orfgin of bile in the herbivora 140 



Origin of hippuric acid ....... 142 



Formation of the chief secretions and excretions . . 144 



Soda essential to the bile 146 



Relation of urine to bile 148 



Relation of starch to bile . ..... . 150 



Uses of common salt 153 



Certain remedies take a share in the vital transformations 161 



Chief qualities of the blood 163 



Modus operandi of organic remedies .... 165 



All organic poisons contain nitrogen .... 168 



Theine identical with caffeine 170 



Relation of theine and caffeine to bile . . . . 170 



Theory of their action 171 



Theory of the action of the vegetable alkalies . . 173 



Composition and origin of nervous matter . . . 174 



It is related to that of the vegetable alkalies . . 176 

 Theory of the action of the latter . . . . .178 



Phosphorus seems essential to nervous matter . . 180 



