102 



LOCK : PRESENT STATE OF 



A sufficiently near appioach to equality in each case. In 



addition to this, it was found that — 



Gives in F 2 approximately 



3 gi'ay : 1 white 



9 purple spotted : 3 gray : 4 white 

 9 purple spotted : 3 gray : 4 white 

 9 maple : 3 gray : 4 white 

 9 maple : 3 gray : 4 white 

 ssmmcc, &c. 27 maple pm'ple spotted : 9 maple : 

 9 pvirple spotted : 3 gray : 16 white* 



* These figures may be readily understood on studying the accom- 

 panying diagram, in which all the possible combinations of the three 

 pairs of allelomorphs S-s, M»-m, and C-c are set down at length. It 

 will be seen that C is wanting from 16 of these combinations ; these are 

 therefore white, and tliough S or M or both may be present in these 

 zygotes, they are masked and unable to make their appearance. S is 

 always completely masked under these circmnstances, but M may be 

 only partially masked, and we can then distinguish 12 ghost maples 

 from 4 pm*e whites. 



Among the combinations which contain C, 3 contain neither S nor M ; 

 they are tlierefore gray. Of the remainder, 9 contain S but not M, and 

 9 contain M but not S, wliilst 27 contain both. All these zygotes 

 exhibit their appropriate characters. 



Certain irregularities in the inheritance of the purple-spotted 

 character are not yet completely cleai'ed up. 



