Sept. 18, 1916 



Dwarf Eggs 



997 



Table XIX.— Correlation between egg weight and egg index in dwarf eggs with small 



yolks 



Table XX shows the correlation coefficients deduced from Tables VIII 

 to XIX (or in the case of yolk weight from the data) with their probable 

 errors, and also similar coefficients for normal eggs. The correlations 

 are all calculated from the usual Bravais formula 



r = 



S(xy) 



where iV = number of eggs; x and y are the deviations from the means 

 and a t and <x 2 the standard deviations of the two variables. 



Table XX. — Correlation coefficients for the size and shape characters of the dwarf and 



normal eggs 



a These coefficients were calculated directly from the data given in Table III. 



