x CONTENTS 



CHAPTER PAGE 



XXIV. THE ALLIES OE THE PERCH: PISCES 310 



XXV. THE GREEN FROG 327 



XXVI. THE ALLIES OE THE FROG : AMPHIIJIA 339 



XXVII. THE PINE-LIZARD AND ITS ALLIES: REPTILIA . . 348 



XXVIII. THE DOMESTIC PIGEON 304 



XXIX. THE ALLIES OF THE PIGEON: AYES 374 



XXX. THE GRAY SQUIRHEI 398 



XXXI. THE ALLIES OF THE SQUIRREL: MAMMALIA . . . 408 



XXXII. THE HISTORICAL DEVELOPMENT OF ZOOLOGY . . . 430 



INDEX . 4f)3 



