'290 BJ. ATLEN AND: EP Wee SEXONE 
Female Gametes CB, CR, cB, cR 
Male =, the same as the female. 
Pedy goles CBS =0 Bs | OR aE 
CB CR c B | cR 
GR .CR | CiRener 
Pp =<CB CR c B eR 
e768 (eam) eB eB 
CB CR c B cu 
Cal as Gam Cake cR 
CB CR c B ec R 
That is 9 Black, 3 red and 4 albinos. 
It will be seen therefore that according to either theory the visible 
result should be exactly the same in the F, generation, viz. :— 
9 Black, 3 Red, 4 Albino. The experimental result was 
91 black, 26 red, 37 albino and theory requires 
Site OO he eae which is a good agreement. 
The germinal constitution will however be different according to which 
hypothesis is true. We will consider the different colour classes separately. 
Under Hypothesis I there would be six different kinds of black-eyed 
animals, which in every sixteen animals would occur on the average 
as follows :— 
one normal pure black, without the albino factor ; (CC B B); 
two Pe Rs » with Pe “ > (Ceo BB 
one pure black, with one dose of black only instead of two, and without 
the albino factor ; (C C B) ; 
two ,,  ,, with one dose of black and with the albino factor ; 
(Cc B); 
one black carrying red, without the albino factor ; (CC B R); 
two =, x So Wal E 5 (Cie -B AR): 
Under Hypothesis II there would be only four different kinds of black- 
eyed animals, viz. :— 
one normal pure black, without the albino factor ; (C C B B) ; 
two ,, & a avr EB Ks Ag (C ceB BB) 
two black carrying red, without. ,, Br 55 (CC BR); 
four ~ % > awit ¥ =e A: (Ces Bik): 
The difference between the results given by the two hypotheses is 
that under IT there are no blacks with one dose of black only, their 
place being taken by additional hybrid blacks. 
One means of testing the hypotheses, therefore, will be to find out 
