O. A. Merritt Hawkes 14r 



No "matings produced only full spotted (S) larvae, but three raatings 

 (30, 47, 17) produced 8 and R8 larvae but no plain ones — -the results 

 of these matings are as follows : 



Totals ... — 59 24 



The history of mating 30 is interesting, for it had a series of 

 descendants,, all of which were 8 and RS, none being F, until in F^ there 

 appeared a family consisting entirely of .Si larvae (see Table II). Evi- 



TABLE II. 



Table to show the Inheritance of a Pure S Family. 



P (ricini) x S {cijnthia) 



I 

 !— ^ * 



r 



I I 



Fi SI (67) X .9 1 (68) and RS larvae 



, ^-r 



II 

 i?2 8 6 (22) X S 6 (19) and RS and P larvae 



I " r- 



RS 30 (15) and S and RS but no P larvae x Sf 42 (7) and RS and P larvae 



I I 



S 75 (12) X S 75 (11) and RS but no P larvae 



I 



S 93 (1) X S 93 (2) and RS but no P larvae 



. j^^ The offspring of mating 107 which consisted entirely of S larvae 



The formulae used are to be interpreted thus : for example, RS 30 (15) and S and RS 

 but no P larvae means, the individual was a larva with reduced (RS) spots, the offspring 

 of mating 30, of which it was the fifteenth member, and in its fraternity were produced S 

 and RS, but no P larvae. 



dently the parents of this mating (30) had all the reproductive cells 

 supplied with some factors or gens for spots, but it was only in the .^5 

 generation that two parents were chosen, which had all the gens which 

 are necessary for a complete (>S^) or cynthia type of larva. It ma}'^ be 

 that the results would have been reached more quickly if there had been 



