O. A. Merritt Hawkes 141 



No matings produced only full spotted {S) larvae, but three matings 

 (30, 47, 17) produced >S' and RS larvae but no plain ones — the results 

 of these matings are as follows : 



Totals ... — 59 24 



The hi.storj' of mating 30 is interesting, for it had a series of 

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

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



TABLE II. 



Table to show the Inheritance of a Pure S Family. 

 P {ricini) x S (cynthia) 



I 1 



S 1 (67) X .S' 1 (68) and RS larvae 



S 6 (22) X S 6 (19) and RS and P larvae 



I * , ■ a 



I I 



fg RS BO (15) and S and RS but no P larvae x S 42 (7) and RS and P larvae 



I I 



S 75 (12) X S 7? (11) and RS but no P larvae 



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



I 

 Ff, 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 Ti.S 

 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 F^ 

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

 are necessary for a complete {8) or cynthia type of larva. It ma}' be 

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



