>ve, however, that other plastids might not have such 



Vernon L. Kellogg, of Leland Stanford University, 

 as recently published an important paper on inheritance in silk 

 rorms. 5 In common with Coutagne and Toyama he found many 

 endelian characters in these insects. This was especially the 

 ise for characters of the larvae. For instance, the mouricaud 

 ^attern (a dark form) in the larvae was dominant to white. The 

 ame was true of the tiger banded, or zebra, type of coloring. 

 \ white type with a well marked darker pattern, which in the 

 Moratory is known as "the patterned type" behaved usually as 

 unit character recessive to zebra and dominant to white. Its 

 ehavior was entirely Mendelian in crosses with white, but there 

 ■as some irregularity in crosses with zebra. The irregularities 

 mentioned by Professor Kellogg are fully explained by assuming 

 that the pattern character and the zebra character are inde- 

 endent Mendelian characters, and that when both are present 

 1 the same individual they can both be discerned. 

 The author was puzzled a good deal by the behavior of white 



mes recessive to individual or strain idiosyncrasies. A large 

 umber of matings are given with their results in the first and 



lheritance of white. Evidently. Professor Kellogg was dealing 

 ith animals in which there are two distinct types of white, one 

 ominant and the other recessive. A similar case has been well 

 lade out for poultry, and I have found indications of two such 

 hite characters in swine, though the recessive white in swine is 

 ot fully made out. All of the irregularities in the inheritance 



