CONTENTS. 



Page. 



Introduction '. 5 



Historical review of the literature 5 



Methods of analysis and plan of work 8 



Experiments on rabbits 9 



General discussion 9 



Series I 11 



Series II 12 



Series III 13 



Series IV , 14 



Series V , 15 



Series VI 16 



Series VII 17 



Series VIII and IX 17 



Experiments on guinea pigs (Series X and XI) 18 



Experiments on cats and dogs 20 



Summary and concl usions 21 



Bibliography 23 



3 



