No. 577] UNIT-CHARACTER CONSTANCY 27 



reacquires much of the importance which it was regarded 

 as possessing in Darwin's scheme of evolution, an impor- 

 tance which many have recently denied to it. 



Second Series 



■2.2a 2.50 ■>.", :s.oo :;. 



2 2 ...... . 



The question whether an imaginary "unit-factor" for 

 English pattern has or has not changed in correlation 

 with the visibly changed English unit-character is not 

 here discussed. We recognize that it has an academic 

 interest, which, however, scarcely affects the practical 

 question whether the visible Mendelizing characters of 

 animals are subject to change through crossing or through 

 selection or both. 



