272 MENTAL EVOLUTION IN ANIxMALS. 



in its work of organizing instincts, intelligent adjustment is 

 always under the direction and control of natural selection, 

 so that its chief function in the formative process is probably 

 that of supplying to natural selection variations of ancestral 

 instincts which are not merely fortuitous, but intentionally 

 adapted to tlie conditions of the environment. 



