130 



RAYMOND PEARL 



large extent, be used as a control on the alcohol experiments 

 with the same forms. 



To those not entirely familiar with the breeds of poultry it 

 may be helpful to call attention to certain of the more impor- 

 tant characteristics of these two breeds. To this end figures 1 

 and 2, and table 1 are presented. Figure 1 shows a normal 

 Black Hamburg male and figure 2 a normal Barred Plymouth 

 Rock female. These are the forms used in these particular 

 experiments (p. 138). 



It is not the intention to give any detailed account in the 

 present paper of the mode of inheritance of the differences be- 

 tween the two breeds exhibited in table 1. Full discussion of 

 these matters is left for consideration in another paper, in which 

 normal, untreated birds only will be dealt with. In the third 

 paper of this series certain details that are necessary to the 

 understanding of the alcohol experiments will be given regarding 

 the normal inheritance of these characters. 



TABLE 1 

 Showing the chief characteristics of the Black Hamburg and Barred Plymouth Rock 



breeds of poultry 



CHARACTER 



Plumage color 



Plumage pattern 



Comb 



Ear lobes 



Shank color 



Plantar surface of feet. . . 



Beak 



Skin color 



Egg color 



Body size (standard 

 weights)^ 



Egg-laying ability 



BARRED PLYMOUTH ROCKS 



Black and white 



Barred 



Single 



Red 



Yellow 



Yellow 



Yellow 



Yellow 



Brown 



Large: cockerel = 8 

 pullet = 6 

 cock = 9^ 

 hen = 7i 



Good (cf. Pearl, 20) 



lbs. 

 lbs. 

 lbs. 

 lbs. 



BLACK HAMBURG 



Black, with greenish 

 sheen 



Self 



Rose 



White 



Black or leaden blue 



White 



Black or dark horn 



White 



White 



Small: There are no 

 "standard" weights. 

 Pullets average about 

 2J lbs. and hens about 

 2f to 3 lbs. Male birds 

 3| to 4| lbs. 



Poor 



2 Cf. American Standard of Perfection, 1915. 



