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University of California. 



[Vol. i 



as on ever)- subject. In science, the last word is never said on any 

 subject. Old views must give way to new, but let us not lose sight 

 of the germs of truth contained in the old. Evolution of thought 

 must, indeed, continue, but let us remember that evolution is by 

 modification, not by destructions and recreations. Ideas are like 

 species. In the evolution of thought some, indeed, become extinct 

 and leave no progeny, but some are transformed into new, and all 

 the new come only by such transformation of the old. All I can 

 hope is that those expressed above are among the plastic ones, 

 which will not be destroyed but changed into higher forms. 



