x OOXTKNTS 



CHAPTER VI 



PAGE 



THE FROG (continued) : THE VASCULAR SYSTEM -THE CIRCU- 

 LATION OF THE BLOOD 78 



PRACTICAL DIRECTIONS 98 



CHAPTER VII 



THE FROG (continued) : THE MICROSCOPICAL EXAMINATION 



OF THE SIMPLE TISSUES 104 



PRACTICAL DIRECTIONS IIQ 



CHAPTER VIII 

 THE FROG (continued) : THE MICROSCOPICAL EXAMINATION OF 



THE COMPOUND TISSUES GLANDS SECRETION AND 



ABSORPTION 126 



PRACTICAL DIRECTIONS 136 



CHAPTER IX 

 THE FROG (continued) : RESPIRATION AND EXCRETION . . 141 



PRACTICAL DIRECTIONS 152 



CHAPTER X 

 THE FROG (continued): THE NERVOUS SYSTEM 154 



PRACTICAL DIRECTIONS 175 



CHAPTER XI 

 THE FROG (continued) : THE ORGANS OF SPECIAL SENSE . 1 79 



PRACTICAL DIRECTIONS IQI 



CHAPTER XII 



FROG (continued) : REPRODUCTION AND DEVELOPMENT . 103 



PRACTICAL DIRECTIONS 2IO 



CHAPTER XIII 

 THK FROG (continued) : MEANING OF THE TERM SPECIES THE 



PRINCIPLES OF CLASSIFICATION EVOLUTION ONTO- 

 GENY AND PHYLOGENY HEREDITY AND VARIATION 



STRUGGLE FOR EXISTENCE NATURAL AND ARTIFICIAL 



SELECTION ORIGIN OF SPECIES 215 



