CONTENTS. 



CHAPTER II. Continued. 



PAGE 



RADIATA 123 



ECHINODERMATA 125 



ACALEPHJS . 128 



POLYPIFERA 129 



PROTOZOA 135 



RHIZOPODA 136 



INFUSORIA 139 



PORIFERA 140 



CHAPTER III. 



NATURE AND SOURCES OF ANIMAL FOOD 142 



CHAPTER IV. 



DIGESTION AND ABSORPTION 162 



PREHENSION OF FOOD 163 



MASTICATION 166 



INSALIVATION 176 



DEGLUTITION 178 



DIGESTIVE APPARATUS 181 



GASTRIC DIGESTION : CHYMIFICATION 188 



INTESTINAL DIGESTION : CHYLIFICATION 193 



DEFECATION 195 



ABSORPTION OF NUTRITIVE MATERIAL 196 



SANGUIFICATION 199 



CHAPTER V. 



OF THE BLOOD, AND ITS CIRCULATION 202 



PROPERTIES OF THE BLOOD 203 



CIRCULATION OF THE BLOOD 216 



CIRCULATING APPARATUS OF THE HIGHER AKIMALS . . 222 



FORCES THAT MOVE THE BLOOD 232 



COURSE OF THE BLOOD IN THE DIFFERENT CLASSES OF 



ANIMALS . . . , , 240 



