Trarisplatjtation of Ovaries in Chickens 567 



The black hen (Bs) carrying an ovary from a white hen (^3), 

 mated to the black rooster, gave ordinary black, and black 

 fetuses and chicks with white legs, in about equal numbers. In 

 regard to the chicks from this hen described as ordinary black, 

 some doubt exists as to whether the ventral light colored area 

 described for normal black chicks was not lighter and greater 

 in extent in all cases than in the normal chicks. 



The white hen (f^a) carrying an ovary from a black hen (5 3), 

 mated to the black rooster, gave uniformly spotted chicks, i. e., 

 white chicks with black spots on the dorsal surface of the head, 

 neck, wings, back or on the tail. 



DISCUSSION OF RESULTS" 



Color and Markings of Chicks 



Owing to the uniform results from the controls (see Fig. i), 

 it may be assumed that the strains of chickens used breed true 

 to color. Therefore any variations in the offspring from the 

 operated hens were due to other influences." 



The fact that in all cases of the operated hens white or black, 

 or spotted fetuses or chicks were produced (i. e., the offspring 

 showed variations from the normal in color markings), shows: 



I That the eggs from each of the operated hens were from the 

 transplanted ovary. Take hens B^ and W2 (Fig. 2). These 

 hens were bred to the roosters of their color. Had some portion 

 of their own ovary not been removed at the time of the opera- 

 tion'" (a remote possibility), and was functioning, then we 

 would have expected solid color offspring like the controls. But 



' Size of hens, eggs, chicks, etc., will not be considered at this time. 



' The influence of the operation itself, as well as visual and other maternal impressions, including 

 telegony and the completeness of the removal of the original ovarian tissue, will be rigidly tested in the 

 new series of experiments now being started. In the present paper it must be remembered that these 

 doubtful factors are ignored and the discussion is based entirely upon the results in the six hens herein 

 reported. 



'" Hen £3 died as stated in the table, of indigestion. Postmortem examination revealed an ovary in 

 all respects similar to that of a normal laying hen. This fact alone would seem to be all the evidence 

 required to meet such objection, for should a minute portion of the ovary be overlooked at the time of 

 operation, it is hardly to be expected that the Graafian follicles would increase in number. 



