340 BOOKS AND CURRENT LITERATURE 



The decision as to whether it is desirable to "''split" or to "lump" 

 is made by the taxonomist on a basis which is largely subjective. 

 Such a decision should be made on the evidence of precise quantitative 

 and statistical work, or on the evidence of accurately known environ- 

 mental conditions. It is on such evidence that it will be necessary 

 for future workers to scrutinize the acts of the taxonomist. Professor 

 Clements has begun this scrutiny and botanists will await with in- 

 terest a full presentation of the results of his cultures and experiments. 

 — F. S. 



