ACQVIRED'CHARACTERS IN ANIMAL BREEDING 487 



fowls are alone entitled to any considerable treatment. Guthrie believed 

 he obtained evidence of foster-mother influence in a number of cases of 

 ovarian transplantation. But, as Castle and Phillips point out in their 

 discussion of these cases, the genetic behavior of the fowls concerned in the 



FIG. 192. Guinea-pigs used in experiments on germinal transplantation. 1, a young 

 black guinea-pig about 3 weeks old, type of the animals from which ovaries were taken; 2, 

 albino female No. 27 into which the ovaries from the black guinea-pigs were transplanted; 

 3, the albino male No. 654 which was mated to No. 27. (After Castle and Phillips.) 



experiments was imperfectly known and the results were such as lent 

 themselves to more logical interpretation as cases of ovarian regeneration. 

 C. B. Davenport in fact repeated these experiments in a more critical 

 fashion and found that in every case ovarian regeneration occurred, and 



