272 



Eakl W. Benjamin 



hatched (Benjamin, 1912 and 1914). The coeflScients of correlation for 

 these preUminary studies are summarized in table 62 and in figure 43. 



In both years the value r seems to have been higher during cold weather, 

 which occurred, for the 1911 offspring, from the thirtieth to the forty- 

 fourth week and from the ninety-second to the one-hundredth week, 

 and for the 1912 offspring from the thirtieth to the forty-fourth week. 

 This seems to be due to the fact that the larger, stronger birds were 



