X CONTEXTS 



CHAPTER VI 



THE FROG (continued) : the vascular system— the circu- 

 lation OF the blood • 



PRACTICAL DIRECTIONS . .... 



PAGE 

 78 



CHAPTER VII 



THE FROG (continued) : THE .MICROSCOPICAL E.XAMINATION 



OF THE SIMPLE TISSUES . . . 104 



PRACTICAL DIRECTIONS ... . . -119 



CHAPTER VIII 



■IHE FROG (continued) : THE MICROSCOPICAL EXAMINATION OF 

 THE COMPOUND TISSUES — GLANDS — SECRETION AND AB- 

 SORPTION . . .... . ... 126 



PRACTICAL DIRECTIONS . -135 



CHAPTER IX 

 THE FROG (continued) : respiration a.nd excretion .... 141 



PRACTICAL DIRECTIONS 1 52 



CHAPTER X 

 THE FROG (continued): the nervous SYSTEM . . . 154 



PRACTICAL DIRECTIONS .... . . . 1 75 



CHAPTER XI 



THE FROG (continued) : THE ORGANS OF SPECIAL SENSE . I79 



PRACTICAL DIRECTIONS . . . 191 



CHAPTER XII 

 THE FROG (continued): reproduction and development. 193 



PRACTICAL DIRECTIONS . . 2IO 



CHAPTER XIII 



THE FROG (continued) : meaning of the term SPECIES — THE 

 PRINCIPLES OF CLASSIFICATION — EVOLUTION — ONTOGENY 

 AND PHYLOGENY^-HEREDITY AND VARIATION — STRUGGLE 

 FOR EXISTENCE — SELECTION — ORIGIN OF SPECIES . . 215 



