1911] SHULL—REVERSIBLE SEX-MUTANTS 330 
in family o8t19. This series of experiments, like those under 
case IIT, was calculated to discover any genetic differences which 
Pedigree no. 
Result Pedigree no. Result 
442:203:14 OGTSALGWH YS Saree aes 579: 263 
§52:278 OOTES ee os ee 489: 423 
4195375 O0156. cee 549: 418 
422: 31% OO1S7 Cty ek ere 562:328 
473: 33% OO1 SS eo aa nw sey SG 592:259 
472:378 OORT i. oe ees 512: 298 
508: 298 OOIQO RS is ie eigen ee 432: 29% 
659: 259 OO1OT cise ee 529: 298 
382: 348 Opthz eo 259: 30% 
51%: 40% OG104. os see 562: 332 
522: 258:14 O9104 Se ee 169: 14% 
49%: 308 OOIO§. 0. Ss Pane 462: 409 
512245 OQN0G 2. Sis oy 362: 19% 
662:243:16 || 09167 362: 190% 
492:229 ates foe 
Total... oes see \13829: 867%: 36 
might exist among F, hermaphrodites, and the fact that these 
29 different individuals when crossed with a single female produced 
e's ie 
|__ 
(Mutant) es 
fe) 
on 
1382 
Fic. 4.—Model pedigree for case IV 
essentially identical results leads to the conclusion that no such 
Senetic differences existed. This conclusion is apparently open to 
| 
| | 
5 fom 
7 
3 
