The Shakespeares of Plants and Animals. 35 



or less constant form is the all-important quality. We 

 need not merely the correlation of qualities making a 

 desired individual, but the power to reproduce such 

 correlated qualities in the young. It is not strange that 

 only one in thousands or in tens of thousands carries 

 that exceedingly complex combination of characteristics 

 which makes up the strains of blood desired for a given 

 definite, yet often trying and important field of plant 

 or animal production. 



