xiv CONTENTS 



CHAPTER VI 



PAGE 



Model of the Circulation - 218 



The Circulation in the Frog's Web 221 



The Heart of the Sheep 222 



Blood 222 



The Kidney - 223 



The Salts of the Blood 223 



Function of Bicarbonates 224 



Vaso-Motor Effects 224 



Action of Drugs on the Heart 225 



The Beat of the Heart 225 



CHAPTER VII 



Dividing Nuclei 226 



Development of the Frog - 226 



Ova and Spermatozoa 226 



The Structure of a Flower - 227 

 Process of Fertilisation in the Plant - 227 



