PREPARING POULTRY PRODUCTS 



471 



the thirty-dozen case (IJ pounds per dozen), show a very 

 small air cell, and a smooth, strong shell free from cracks. 

 Only firsts are usually considered as fit for storage. 



Seconds. — Second-class eggs are those which are not up to 

 standard in physical qualities or show a more or less marked 



Fig. 227 



Fertile egg after twenty-four hours of incubation. 

 Animal Industry.) 



(Courtesy of Bureau of 



deterioration in food qualities. The poor physical qualities 

 that cause rejection for the first grade, without regard to 

 its food qualities, are lack of size, being dirty or stained, 

 washed, or having a markedly rough or misshapen shell. 

 The kinds of deterioration in food quality and which render 



