292 Proceedings of Indiana Academy of Science. 
pounds, with eyes intermediate in color between the parent types. If the 
genes for these different eye colors are allocated at different levels on the 
sex chromosome there should appear among the grandsons eyes of the wild 
type as a result of the phenomenon of crossing over. The evidence presented 
from these combinations is consistant with that obtained from other tests 
in showing that this does not occur. 
The nomenclature employed is that used in other publications for the 
members of this system.—white w, tinged wt, buff wbu, eosin w®, cherry w‘, 
coral w, blood wb, red W. 
The female is expressed by the formula XX, the male XO, consequently 
the formula for a tinged eyed female is wtwtX X, a tinged eve male wtXO. 
The following tables give the results of the combinations made between 
the different members of this allelomorphie series. The genetic composition 
of the parents (P), the children (F,), and grandchildren (F,) are expressed 
in terms of the nomenclature stated above. The numbers indicate the num- 
ber of flies realized from the different combinations. 
1. Linkage of Buff and Tinged 
(a) Buff 9 by Tinged 7. 
P. whuwbuXX . wtXO 
F,. wbuwtxX wbuXO 
(ie 52 58 
(2). 200 185 
(3). 406 301 
F, | WwbuywbuX X wbuw'XX | wbhuXO w'XO. 
| 
i Mayes Skene aoe eae 135 | 112 
Ae teh i 155 | 110 
A | 84 | 56 
DE ate 7 | 58 | 28 
See Mieke 464 | 129 136 
MU hat abe Pathe oss 83 65 
1a | Oe, Se ara ee ae | 136 118 
ADE. cawes lt gserage «7 45 53 
Lio SA OP eae Bee 91 70 
CA Ba Meus Seve tas « 130 93 
a a eee | 75 115 
a ge ee a ee 85 96 
Dig cine ce a ashe e 23 30 
CR SP 95 108 
Totals. a. 1324 1190 
