HISTORICAL SKETCH 447 



as well as with objects. Every field concerned has thus gained a wider 

 appreciation of the significance of its own data. No tendency of the 

 present is more encouraging to the investigator and promising for the 

 future of biology than the development of such alliances, for they afford 

 our only strong hope that we shall come nearer to a solution of the 

 peculiar problems presented by living organisms. 



