1%2 REPORTS ON THE STATE OF SCIENCE.—1914. 
Black carrying blue (Dd BB) x silver-fawn (dd bb). 
F, 1 black : 4 blue observed. 
2-5 2°5 calculated 1.1 ratio. 
Black carrying chocolate (DD Bb) x silver-fawn (dd bb). 
F, 14 black : 10 chocolate observed. 
12 12 calculated 1 . 1 ratio. 
Black carrying blue (Dd BB) x black carrying silver-fawn (Dd Bb). 
F, 2 black : 1 blue observed. 
2-25 0:75 calculated 3. 1 ratio. 
Black carrying blue (Dd BB) x black carrying chocolate (DD Bb). 
F, 4 blacks observed. 
4 calculated. 
Black x chocolate. 
Black homozygous (DD BB) x chocolate homozygous (DD bb). 
F, black (DD Bb). 
F, 16 black : 7 chocolate 
42 17 Durham. 
58 24 observed. 
61:5 20:5 calculated 3-1 ratio. 
Black homozygous (DD BB) x black carrying chocolate (DD Bb). 
F, black. Four matings gave 16 black young. 
Black carrying chocolate (DD Bb) x chocolate homozygous (DD bb). 
F, 4 black : 4 chocolate observed. 
4 4 calculated 1 . 1 ratio. 
Black x blue. 
No matings DD BB x dd BB, but F, from black (DD BB) x black carrying 
blue (Dd BB) gave 16 black young as the result of three matings. 
F,. None of the F, generation were mated, but the following results of matings 
between blacks unconnected with the above are such as would be expected if both 
blacks carried blue (Dd BB). 
Dd BB Dd BB 
33 ¢ x 35 9 gave 5 black : 2 blue. 
33g x 3852 4, 8 1 
She Kade. 44-7 2 
26°16 x 2a 2) 1 
16 6 
50 13 Durham, F, from black x blue. 
66 19 observed. 
63-75 21-25 calculated 3. 1 ratio. 
Chocolate x silver-fawn. 
Chocolate homozygous (DD bb) x silver-fawn (dd bb). 
F, chocolate (Dd bb). 
F, 14 chocolate : 7 silver-fawn. 
1 ex pair chocs. of unknown parentage. 
17 8 observed. 
18-75 6:25 calculated 3.1 ratio. 
