DOUBLE MATING 39 



or struggle to fertilize, or in some other way control the development of 

 the egg. And the race that is potent in these mixed matings may be 

 the one possessing those characters which are dominant in the Men- 

 delian sense in cross matings. That is the yellow cocoon color repre- 

 sented by the Istrian race in several double matings where the Istrian 

 male is either the first or second in mating, where his coupling time is 

 either the shorter or the longer, is dominant in each case over the white 

 cocoon color represented by the Bagdad female or male and over the 

 green cocoon color represented by the female or other male (Japanese 

 Green) involved in the double mating. (See lots numbered 236, 238, 

 and 239.) 



But in lots III and 113 we have a potency on the part of the 

 Bagdad race, represented in one case by the female and one of the 

 males, in the other by only one of the males, which does not correspond 

 to any dominancy on the part of the character, i. e., white cocoon color, 

 which reveals this potency. In both these double matings, Italian 

 Salmon being the other race involved, the offspring all spun white 

 cocoons. But in simple cross matings of pinkish-salmon cocoon-color 

 with white cocoon-color, white is usually the recessive character. 

 Hence dominancy of character does not explain the results obtained 

 in lots III and 112. 



But confirmatory matings are necessary before accepting the re- 

 sults of lots III and 112 as something regularly to be expected under 

 similar conditions of mating. As I have already said the work is 

 being more extensively carried on, and will be reported on in the future. 



