9 8 4 



Journal of Agricultural Research 



Vol. VI, No. 25 



Table IV. — Constants of variation in size and shape in the several types of dwarf eggs 



and in normal eggs 



o Calculated directly from the data (Table III) for the 16 eggs on which the weights of the parts were 

 known. 



The flocks which produced the dwarf eggs were largely composed of 

 Barred Plymouth Rock birds from 5 to 17 months of age — that is, the 

 birds were for the most part of the same age and strain as those pro- 

 ducing the eggs from which the normal variation constants, were calcu- 

 lated. Most of the dwarf eggs were produced by birds of this age and 

 strain. A few were produced by birds of other breeds and a few by 

 older birds. Barred Plymouth Rock birds in their first year produced 

 dwarf eggs which extend over the whole range of size and shape. The 

 slight heterogeneity of the material can not have so materially affected 



