4 io THE POPULAR SCIENCE MONTHLY 



In fact, it seems as if Darwin and Wallace, Nageli, Haeckel, Dohrn, Weis- 

 mann, De Vries and a host of other investigators, had grappled with an all-em- 

 bracing problem— a problem of problems that must engage the best energies of 

 all the sciences for centuries yet to come. 10 



It is a striking evidence of the slight degree to which our subjects 

 have been developed that we are so often blind to the general implica- 

 tions of our work, and the need for help from every conceivable quarter 

 was never greater than now. The opportunity to acknowledge the 

 influence of the great group of English biologists — Darwin, Huxley 

 and Wallace, who showed that evolution of some kind and through 

 some agency was a fact — upon my own line of work in an apparently 

 distantly related field is a particularly grateful one. And it is more in 

 the hope of directing attention to the tremendous breadth of the prob- 

 lem than of emphasizing any particular views of my own that this 

 article is written. And if what I say may direct the attention of any 

 other worker, in an apparently far removed and exceedingly specialized 

 line, to what he may have to offer on the great problem of evolution in 

 general, it will be well. 



10 Whitman, Bulletin of the Wisconsin Natural History Society, New Series, 

 1907, V., p. 6. 



