138 Inheritance in Philosamia Hybrids 



these spots and were called "reduced spots" (RS). The two types were 

 distributed among the 110 imagines as follows : 



38 28 



Totals 66 44 



This table shows a preponderance of males among the spotted forms, 

 but further investigation showed that the character was not sex-limited. 



TABLE I. 



Table to shoii- residls of various matings in the F, generation. 



The first column contains the numbers given to tlie matings and used throughout the 

 records ; thus il 5 means niniing five. 



The ordinary numerals refer to the larvae and the italics to the imagines. 



The fo r/eiieration. 



Twelve matings produced twelve F., families, which consisted of S, 

 ES and P types of larvae in the proportions 3 {S x RS) to 1 P. Every 

 variety of mating (see Table I) was made to test whether S and RS had 

 different hereditary values, but these few matings gave no indication of 

 any difference. It is equally clear that no mating took place between 

 homozygous forms of either S or RS. This generation only showed that 

 some type of spotted form was dominant. The particular S and RS 

 parents used in these i:)articular matings appear to have the same inherit- 

 ance value, as judged by their offspring. 



It was observed that there appeared a regularity in the disajjjjear- 

 ance of the spots, for example, when only one spot was lacking, it was 



