THE SUM OF HIS WORK 



Just as followers of Weissmann were obliged 

 to shift their ground to meet the evidence brought 

 by new experiments, until finally all that remained 

 of their doctrine had been substantially har- 

 monized with and blended into the broader and 

 earlier theories of Darwinian heredity, only the 

 doctrine of the continuity of the germ plasm re- 

 maining as a permanent acquisition; so the attempt 

 to make "Mendelism" comprehend the entire sub- 

 ject of heredity, has necessitated a perpetual modi- 

 fication of the point of view, and an amplification 

 of the terminology to meet the facts of more com- 

 prehensive experiments, until Mendelism has come 

 to be harmonized with and blended in the more 

 comprehensive knowledge of heredity, leaving 

 only the formulae associated with dominance and 

 recessiveness to mark the individual contribution 

 of Mendel to the all-comprehending subject of 

 heredity. 



Into an atmosphere of in- 

 quiry and doubt and solicitude, 

 came the document from Santa 

 Rosa, ostensibly only a nursery 

 catalog, but conveying a mes- 

 sage on heredity that made 

 itself heard far beyond the 

 province of the nurseryman. 



