120 BREEDING 



consideration. It may be expressed in general terms 

 in the following scheme : — 



[Parents] Pale form x Colourless form 



[First Hybrid Generation] Dark form 



[Second Hybrid Generation] 3 Pale form 



9 Dark form 

 4 Colourless form 



The three categories are written in this order, 



3:9:4, instead of 9:3:4 for a reason which will 



shortly appear. The manner in which the two cases 



which we have considered fit into this scheme is as 



follows : — 



Seed-coat Colour 



[Parents] Grey x White 



It will also be apparent, on reflection, that the 

 phenomena of the inheritance of colour observed in 

 the mice fits into the same scheme : — 



