392 Mr. G. P. Mudge. On the Hereditary [Jan. 14, 
the expectation is 2 Cr 4+1Cr5+1Cr60. The result (experiment 35) is 
8 Cr 44+3 Cr 5+2 Cr 6 0. 
If the albino parent be cgBSP and the Cr 5 parent is homozygous, the 
expectation is that the offspring shall be all of the “Irish” 6 form. The 
result (experiment 37c) is nineteen “ Irish” 6 individuals. 
If the albino* is cGgBSP and the piebald carries ¢ recessive, the expectation 
is 
2 Cr4+1 Cr2+1Cr60; 
the result is 3, +2 , +1 ,, (experiment 378.) 
A sister of this albino parent (experiment 378) was also mated with a 
black piebald (experiment 34). No grey individuals appeared in her 
offspring of eight. This, of course, is evidence that segregation of characters, 
ze. blackness and greyness, occurred. — 
(3) Cr 5x Cr 5 = Black Piebald x Black Piebald. 
(a) ILeterozygous Cr 5 x Heterozygous Cr 5. 
Expervments 25, 27, and 28a. 
The heterozygous Cr 5 carries c. The expectation is 1 Cr 4 :3Or5. The 
actual result is 16 Cr 4434 Cr 5. ; 
If we add the results of other observers, the figures stand thus :— 
f Cramper S4ce4. vee 12 Cr 4445 Cr 5 
1 (Doncasbert: pec ce A yet Sto) elas, 
Mudge.) citee ss eeceee 16, +34 , 
Totals setae cade. s a2 vy +88 4, =1:35 nearly. 
With this total of 120 the predicted proportions are 30: 90. 
(b) Heterozygous Piebald x Homozygous Prebald. 
Experiments 26 and 28. 
The expectation in this case is that all the offspring will be piebald. The 
result is 11 piebalds. The further expectation is that some of the piebald 
offspring will be homozygous and some heterozygous. Experiments 31 and 
56§ show respectively that the offspring of mating 26 was: one of them 
heterozygous and another homozygous. 
* The] previous behaviour of this albino is worth noticing (see experiment 45, first 
paper). 
+ ‘Land. Jahr.,’ vol. 14, 1885, pp. 596 and 597. 
t ‘Camb. Phil. Soc. Proc.,’ vol. 13, 1906, p. 223. 
§ See first paper. 
