HOUWINK’S EXPER. CONC. THE ORIGIN OF SOME DOMESTIC ANIMALS. 161 
EXPLANATION OF ABREVIATIONS USED IN TABLES 1—6. 
Every bird is characterised by two numbers. The first one indicates 
the number of the experiment in which it was bred. The second one 
shows the order in which the animals are numbered in the experi- 
ments. In a few exceptions of this rule where the first number 
doesn’t indicate the number of the experiment the animal is 
bred in, this is put in |__|. The numbers of the birds with 
not-single comb (rose comb, crowncomb etc.) are in italics, those 
of birds with single comb not. Behind the number and the sign 
of sex we put as a suffix a short characteristic of the animal 
always in the same order. 

The first letter regards plumage: 
b == bankiva colour. 
w = white 
bs = bankiva silky feathered. 
ws = white silky feathered. 
(s) means feathers intermediate between normal structure and silky. 
The next sign is a number indicating the toes. 
4 = 4 toes on each foot. 
5 = double hallux on both sides. 
4—5= one foot normal and the other with double hallux. 
5—6 + „ double hallux ,, ss » 6 toes. 
Then follows the pigmentation of the skin. 
z = black. 
db = dark blue. 
bl = blue. 
lb = light blue. 
w = without pigmentation. 
The next letter regards the crest. 
c = crest gray brown in 9, goldbrown in if bankiva coloured, 
otherwise white. 
c = crest in ¢ brown, black just behind comb. 
Gn — a black. 
The last letters concern the legfeathering and the vulture hock. 
(If) = slight legfeathering. 
If = feeble legfeathering. 
If = legfeathering moderate. 
Genetica IV. 11 
