Recent Advances in the Study of Heredity. 335 
4. 
D 3 
F x gross. 2 
R ? 
Doncaster has recently made a discovery of extraordinary 
interest. 
The above experiments are incomplete inasmuch as the mating:— 
WILD gross. 5 x Inct. $ had not been made ; only Fj gross. ? x 
lact. $ (see No. 4). The result of this cross is now known ; and 
the result of the cross between the WILD gross, and lad. $ is 
precisely the same as the result of the cross between F t gross. 2 x 
lad. S', namely, in both cases, gross. S s and lad. ? s. In other 
words the ordinary wild grossulariata in districts where ladicolor is 
unknown are in reality a race of which the males are pure gross., 
though the females are in reality hybrids of ladicolor, and so 
continue from generation to generation. 
Normal 2 gross, and the F x 5 gross, from lad. 2 X S gross. 
are identical in composition. Whether a gross. 2 hasgross. ? ora 
lad. ? for a mother makes no difference to its properties. 
D c? 
gross. S 
R 
Well may Bateson remark “ This fact is one of the most 
striking to which genetic research has yet led.” 
gross. S 
D S D S 
gross. S 
DD S $ 
gross. $ 
DD S c? 
gross. ? 
DR ? S 
gross. $ 
DR ? 
lad. S 
R c? R S 
gross. $ 
DR $ $ 
gross. $ 
DR $ $ 
lad. 2 
RR ? $ 
lad. 2 
RR $ $ 
