IOWA ACADEMY OF SCIENCE 
323 
The factors themselves follow with the tentative composition for the 
different colors: 
Factor C equals Red or yellow basic pigment. 
Factor H equals Black. 
Factor B equals Restriction factor producing bay in presence of H. 
Factor G equals Factor for gray pattern. 
Factor R equals Factor for roan pattern. 
Factor D equals Factor for dappling pattern. 
Factor S equals Star or blaze in forehead and white on legs. 
Factor P equals Piebald and skewbald markings, Dr. Walther ’s 
Schabrackenscheckung. 
Factor M equals Light creamy yellow mane and tail. 
Factor I equals dilution factor dominant to i, intense. 
Chestnut equals C may have B and M in some cases. 
Black equals C H may have D in some cases. 
Mouse equals CHI may have D in some cases. 
Dun equals C I, C B I or C M I according to kind. 
Bay equals C H B. 
Brown equals C H B D. 
Gray equals commonly C H GD, maybe C G D. 
Blue roan equals C II R. 
Red roan equals C R or C H B R, latter commonest. 
Red 
Roan 
Blue 
Roan 
Gray 
Dun 
Bay 
Black 
Chest- 
nut 
R.cr] rnan x red rnan 
45 
5 
Red rnan ^ bine rnan 
33 
11 
2 
2 
-- 
_____ 
"R.pr? rnan x gray 
37 
7 
27 
4 
Rerl rnan x bay 
93 
6 
27 
101 
7 
10 
Red rnan x black 
14 
4 
1 
5 
11 
1 
Red rnan x chestnut 
18 
2 
4 
12 
2 
4 
Rlne rnan x blue rnan 
1 
3 
1 
Blue roan x gray 
1 
2 
Bine rnan x bay 
1 
8 
3 
1 
Blue roan x black 
1 
Rlne rnan x chestnut, 
1 
_, 
--- 
Gray x gray 
66 
13 
Gray x dun 
7 
5 
2 
Grav x bay . 
1? 
50 
54 
6 
9 
u Gray x black .... 
18 
5 
14 
20 
5 
* Grav x chestnut _ _ 
14 
7 
2 
10 
Bun x dun 
2 
1 
1 
Dun x bav ...... r 
1? 
4 
4 
__ 
1 
Dun x black 
3 
1 
1 
1 
Dun x chestnut - _________ __ 
1 
1 
Bay x bay 
5273 
274 
672 
Bav x black 
1218 
476 
130 
Bav x chestnut . 
826 
70 
497 
Black x black 
15? 
391 
41 
Black x chestnut. 
135 
65 
108 
Chestnut x chestnut. 
6? 
10? 
1594 
