ACQUIRED 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 
Fic. 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 Casile and Phillips.) 
experiments was imperfectly known and the results were such as lent 
themselves to niore 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 
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