Fig. 32. — Diagram, photographed from draughtsmen, to illustrate 

 Mendel's Law. 

 First line, (P) a black dominant and a white recessive. Second line (F) the hybrid off- 

 spring D(R), the black patent, the white latent below. Third line (F-) one " pure" black, 

 two "impure" blacks, and one "pure" white, iDD + 2D(R) + iRR. Fourth hne 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. 



