No. 530] RELATIVE C0N8PICU0USNE88 OF FOWLS 109 



From these photographs the following points are to be 

 noted : 



1. As compared with self-colored birds the barred in- 

 dividuals obviously are relatively much less conspicuous, 

 when under the same light conditions, and when seen 

 against the same kind of a background. The pictures of 

 the barred birds (Figs. 3 and 4) are not, to be sure, like 

 the ''puzzle" pictures of supposedly protectively colored 

 organisms, which one sometimes sees, where it is exceed- 

 ingly difficult to distinguish the animal from the back- 

 ground at all. In both Figs. 3 and 4 it is easy enough 

 to see the bird, but at the same time these birds are 

 obviously much less conspicuous than those shown in 

 Figs. 1 and 2. 



2. This ineonspicuousness is equally marked whether 

 the barred bird is in the bright sunlight (Fig. 3) or in 

 a relatively deep shadow (Fig. 4). 



3. These pictures furnish objective and unbiased phys- 



