REACTIONS TO LIGHT AND GRAVITY 
IN DROSOPHILA 
ue) 
TABLE 27 
Normal eyed flies 
Group A 
AVERAGE 
SEX Vv R C | 
Sex Violet Red Green 
Stal ete Olen | Olen Vial emer J 100 .0 96 .2 97 .0 
Male..... 2d | 2a | 2b] 1d} Female... 100 .0 99 .5 95 .4 
[ axel |} (0) 4e | 5c 
Tstielen OM 0 (a. Tied twice a. Tied three 
Female.. { |-2d | 3a | 4d | 0 b. Tied once b. Tied twice 
3d | 2b] 2e | 6c Male < ec. Tied three Female < c. Tied twice 
d. Tied once | d. Tied three 
le. Tied three \e. Tied twice 
Group B 
St e2ele2ee Ome elViales a=. - 93.7 93.3 86.6 
Male..... 2d | 3a | 4d! 0 Female... 97.0 96.6 83.7 
3d {1b.| 0 | 6c 
ist 2. | 0 (a. Tied twice 
Female.. | 2d | 4a | 5b} 0 Male! b. Tied once Female / 2 Tied three 
3d 10 |0 |6 | e. Tied once b. Tied three 
| | d. Tied twice 
Groups A and B combined 
StileGenlecen | NOleVlale. 96.8 94.7 91.8 
Male..... 2d | 5a} 6e | Ic | Female... 98.5 98 .0 89.5 
3d | 1b} 4£ |11ld 
tstaleoe eye sO fa. Tied four Be iiedi si 
Female.. ¢| 2d | 7a | 9d] 0 b. Tied once sala 
q 5 b. Tied two 
|| 3d | 2b | 2e |12e c. Tied once 5 
Male : Female <c. Tied two 
\d. Tied four : “ 
|e. Tied three d- tied aga 
e. Tied two 
| 
\f. Tied three 
iveness of that color this theory had to be given up. Thus, at 
the present time I have no explanation to offer for the increased 
effectiveness of red light which appears to accompany the dark- 
ening of pigment in the eye, other than the vague assumption 
that it may be due to some physiological difference which occurs 
in connection with this change of pigmentation. 
