500 A. H. STURTEVANT 
DESCRIPTION OF CROSS-BRED BIRDS 
In F, the males are all alike, whichever way the cross is made. 
They are of fairly typical Columbian color, but perhaps rather 
darker than the parent stock, showing black stripes in some 
back feathers and black ticking (small specks) elsewhere. These 
characters, however, may occasionally appear in a pure Colum- 
bian male. There are two types of F, females, depending on 
the direction of the cross. When a Columbian male is used 
they approach the Columbian color, but differ in having coarse 
‘irregular stippling of the Leghorn type, in the same places as 
in the Leghorn female. These and the cross-bred males of the 
type described above I shall, for convenience, call grays. The 
F, red females obtained fromthe Brown Leghorn male and Colum- 
bian Wyandotte female (called browns in my earlier paper) 
are simply grays with the white replaced by a uniform red, about 
the shade of the breed known as Rhode Island Red. The F, 
results have shown that they are not to be considered as browns, 
genotypically like the Brown Leghorns, as I had supposed they 
were. 
In F, occurred several new types, which I shall describe before 
proceeding to the analysis. Red males, like red females, are 
simply grays with red substituted for white. 
