Oll the varying d(iminance of certain white breeds of the silk-worm, etc. 260 



In conformity with our I'xpcctation, he obtained three kinds of 

 Fl broods; i) all white, 2) all yellow and 3) a mixture of i white to 

 I yellow. Their behaviour in inheritance in the posterity agrees 

 exceedingly well with that demanded by our hypothesis, except the 

 F2 yellow mating derived from the F^ white, back-crossed with pure 

 yellow where we expected to have all yellow offsping. Of his 877 

 worms derived from 9 yellow matings we find 6 whites. In our 

 opinion, however, it must be due to some accident. 



There are some slight irregularities found in crosses "a variety 

 of '■'■Jaiine var''' x "B/anc des Alpes" (Lots hg, hh) and "Changhai 

 blanc'' X ^'Jaune var" in which F^ or F2 gave various intermediate 

 forms. As they are, however, not directly connected with the present 

 subject we will discuss them later in a separate article. 



Next we shall see Kellogg's results of experiments made with 

 Bagdad white, Istrian yellow and Italian salmon. 



As before, we tabulate his figures below : 



Table VII. 

 Crosses between Bagdad white and Istrian Yellow. 



