D 



Fig. 3-2 



» 



Fig. 33 Fig. 34 



Figs. 31-34. Results of a cross between two varieties of gninea-pig differing in two unit-characters, 

 color and roughness of fur. Fig. 31, a colored and smooth-coated guinea-pig. 



Fig. 32. An albino and rough-coated guinea-pig. Fig. 33. One of the Fi young, colored and rough. 



Fig. 34. A smooth-coated albino, one of the four varieties occurring amoqg the F2 young. The other 

 three varieties of Fj young are like the parents and grandparents respectively (Figs. 31-33). 



1 jg. :;7 Fig. 38 



F1G8. 35-38. Results of a cross between two varieties of guinea-pig differing in the two unit-characters, 

 color and length of fur. Fig. 35, a colored and short-haired guinea-pig. Fig. 3(i, an albino and 

 long-haired guinea-pig. The Fi young were colored and short-huirod like the parent shown 

 in Fig. 35. Fig. 37, a colored and long-haired guinea-pig, one of the new F2 varieties. 

 Fig. 38, an albino and short-haire<i guinea-pig, the other new F2 variety. The two other 

 F2 varieties were like the grandparents (Figs. 35 and 36), 



