CONTENTS. 



Introduction, , 5 



Experiments with guinea-pigs, . 6 



Heredity of coat color, . . . . 6 



Coat of the wild cavy, 6 



Color varieties of the domesticated cavy or guinea-pig, .... 7 



Agouti, . ... . 7 



Yellow, 7 



Chocolate, 7 



Black, .....,_ 8 



Albino, ..'.'. 8 



Spotted, . . . ..'.". 12 



Brindled, 13 



Roan, and Silvered, . . ... . . . . -14 



Results of crossing the elementary color varieties, . . . . .14 



Albinos and pigmented animals, . . . , ', . . .14 

 Albinism and the "Law of ancestral heredjty," .:. . . 16 

 Albinism and sexual prepotency, . . . . . . . . 33 



Albinism and latent pigment characters, . . . ; . 34 



Intercrossing of different pigment types, . . . . . a6 



The agouti type, . . . . ..... . .26 



Agouti X agouti, 26 



Agouti x black, ..... .26 



Agouti X red. . . , . . .28 



Agouti x albino, . . . .28 



The black type, 31 



Black x red, 31 



Black x albino, . . . . ... . . -34 



The red type, . . . . . . . . % . .36 



Red x albino, 37 



Black-eyed white, -37 



Comparison with pink-eyed mice, . . ; . . -47 



Heredity of rough coat, 56 



Prepotency and dominance, . . .58 



Heredity of long coat 64 



Correlation among coat characters, . ...... 67 



Experiments with rabbits, 70 



Cross between two different types of albinos, .... . . .70 

 Heredity of long or Angora coat, , -73 



Herediiy of lop-ears, . . . , * . 74 



Summary, . . 75 

 Bibliography, 77 



