184 



RAYMOND PEARL 



D 



Fig. 4 Photographs of alcoholized Barred Plymouth Rock hens and their untreated 

 control sisters. A, ethyl treated 9 No. 1481; B, untreated control 9 No. 1726, sister 

 of 1481; C, ethyl treated 9 No. 1489; D, untreated control 9 No. 1738, sister of 1489. 

 Scale of reduction in the negative the same for all. Photographed February 18, 1916. 



