All figures after Castle 



f PLATE, IV, .QV^RJAJT TRANSPLANTATION 



Fig. 1. A youn}*/blck guin$a,'pig iSjfeltlje one whose ovaries were transplanted into the 

 albino shown in*fi*ig. 2. tig! 2. An afbino* gnjnea-pig whose ovaries were replaced by 

 those from su^h a^uinea-pigf aatfiat hoW f n in ^*g. 1. Fig. 3. An albino male guinea-pig 

 with which tti QI{B eh$wn m Fj& 2 was aated ; /Figs. 4 and 5. Two of the six offspring 

 of the ra f ciogso*f the g\ifritea-pigs*sn6wn in Figs. 2 and 3. All the offspring were black. 



