1911] SHULL—REVERSIBLE SEX-MUTANTS 351 
that 11 of them appeared among progenies comprising a total 
of 3331 females and 2126 hermaphrodites. In other words, they 
constitute about o.2 per cent of the total progeny of the genetic 
hermaphrodites when the latter are used as pollen parents. In 
no single family did more than one such male mutant occur. While 
these numbers are too small to allow an accurate estimate of the 
fe 
2 fof : ore 
OF Mtant 
| 
Fic. 13.—Model pedigree for case XII 
relative frequency of hermaphrodite and male mutants, the evi- 
dence seems to indicate that there is no striking difference between 
the capacity of males to give rise to hermaphrodite mutants, and 
that of hermaphrodites to give rise to male mutants, though 
male mutants have appeared with slightly greater frequency than 
hermaphrodite mutants. 
CASE XUI 
WHEN SOMATIC HERMAPHRODITES ARE CROSSED WITH UNRELATED FEMALES 
Pedigree no. Result 
OST2e ca eas 3902:556 
O8152 vig eae cans 269:186 
OOS. ewe eyes 569: 266 
0000: bis eis eee whee eee 632:34¢ 
Totek 6.3 esr 1849:1336 
itarcigeeentencm ten 
