

o' " 1 





V 



**t 



\ 







CONTENTS 



CHAPTER 



I. 



II. 



III. 



IV. 



V. 



VI. 



VII. 



VIII. 



IX. 



X. 



XI. 



XII. 



XIII. 



XIV. 



XV. 



XVI. 



XVII. 



XVIII. 



XIX. 

 INDEX 



THE AMPHIBIA IN GENERAL AND FROGS IN PARTICULAR 

 THE HABITS AND NATURAL HISTORY OF THE FROG . 

 EXTERNAL CHARACTERS OF THE FROG ... 

 PRELIMINARY ACCOUNT OF THE INTERNAL STRUCTURE 

 THE DEVELOPMENT OF THE FROG . . . . 



HISTOLOGY OF THE FROG ...... 



THE DIGESTIVE SYSTEM AND ITS FUNCTIONS . . 

 THE VOCAL AND RESPIRATORY ORGANS . . . 

 THE SKIN ......... 



THE EXCRETORY SYSTEM ...... 



THE REPRODUCTIVE ORGANS AND THE FAT BODIES . 

 INTERNAL SECRETION AND THE DUCTLESS GLANDS . 

 THE SKELETON ........ 



THE MUSCULAR SYSTEM ..,... 



THE CIRCULATORY SYSTEM . 



THE NERVOUS SYSTEM ....... 



THE SENSE ORGANS ..... 



INSTINCTS AND TROPISMS AS RELATED TO REFLEX 



ACTION ......... 



THE INTELLIGENCE OF THE FROG . 



PAGE 



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23 

 62 

 68 

 81 

 121 



134 

 165 

 179 

 201 

 212 

 219 

 229 

 246 

 258 

 283 

 321 



342 

 353 



359 



