THE MENDELIAN CLUE 237 



and how undesirable qualities may be slipped off, 

 and never was it more necessary than now to put 

 all our available science into the art of cultivation 

 and breeding. The average yield of wheat in 

 Britain is about thirty-two bushels to the acre. 

 Professor Wilson tells us that it might be raised to 

 forty or even fifty. " For every day by which the 

 life of a variety of wheat is shortened between seed- 

 time and harvest, the wheat-growing area in Canada 

 reaches fifty or sixty miles farther northwards/' 

 The work done in Denmark shows how the wealth 

 of our country, so far as it proceeds from dairy 

 cattle, might be very nearly doubled. These are 

 two instances out of many which might be cited to 

 illustrate the practical value of Mendelism and it 

 is only beginning. 



