PLATE 7 



— 1 



+ 1 



4-3 



4- 



36 



35 



37 



38 



39 



Fig. 35, a scale of grades for piebald rats, n*"'*^^^^^^ 

 young. Fig. 37, a smooth guinea-pig. Fig. 38, a well-rosettea rougn gu caps-s 

 A. Fig. 39, a poorly rosetted rough guinea-pig, grade L-. 



