All figures after Castle 



PLATE II. MEXDELIAN IXHERITAXCE 

 Fig. 1. A black female guinea-pig. rig. 2. An albino male guinea-pig. Fig. 3. A black 

 female guinea-pig with young by an albino male such as that shown in Fig. 2. Fig. 4. 

 Adult black guinea-pigs from a litter such as that shown in Fig. 3. Fig. 5. Albino and 

 black guinea-pigs whose i>arents are shown in Fig. 4. 



