SOME NEW PRINCIPLES 237 



of their germ-cells. The ancestry of the extracted 

 green, marked with an asterisk, is given below in 

 a pedigree which includes the collateral ancestors, 

 and displays the zygotic constitution, and conse- 

 quently the germinal contents, of all the ancestors. 

 Outside the circles, which represent zygotes, are 

 printed to the right the somatic characters of the 

 individuals, whether yellow (Y) or green (Gr) ; outside 

 the circles, to the left, the ratios in which they 

 occur ; and inside the circles their zygotic formulae : — 



(yv)y X @G 



