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 



