GERM-PLASM AND BODY 



ing experiment performed by Dr. John C. Phil- 

 lips and myself may be cited. 



A female albino guinea-pig (Fig. 11) just at- 

 taining sexual maturity was by an operation 

 deprived of its ovaries, and instead of the re- 

 moved ovaries there were introduced into her 

 body the ovaries of a young black female 

 guinea-pig (Fig. 10), not yet sexually mature, 

 aged about three weeks. The grafted animal 

 was now mated with a male albino guinea-pig 

 (Fig. 12). From numerous experiments with 

 albino guinea-pigs it may be stated emphati- 

 cally that normal albinos mated together, with- 

 out exception, produce only albino young, and 

 the presumption is strong, therefore, that had 

 this female not been operated upon she would 

 have done the same. She produced, however, 

 by the albino male three litters of young, 

 which together consisted of six individuals, all 

 black. (See Fig. 13.) The first litter of young 

 was produced about six months after the oper- 

 ation, the last one about a year. The trans- 

 planted ovarian tissue must have remained in 

 its new environment therefore from four to 

 ten months before the eggs attained full growth 



31 



