F ' 



FIG. 32. Diagram, photographed from draughtsmen, to illustrate 

 Mendel's Law. 



First line (P\ a black "dominant and a white recessive. Second line (F 1 ) the hybrid 

 offspring DiRi, the black patent, the white latent below. Third line (F 2 ) one " pure" 

 black, two " impure " blacks, and one " pure " white, iDD+2Dt R) + iRR. Fourth line pure 

 extracted dominant to the extreme left, pure extracted recessive to the extreme right ; 

 in the middle, as usual, iDD+2D^R) + iRR. 



{.Facing p. 340. 



