io6 MIND IN EVOLUTION CHAP, vi 



the organism without clear prevision of those results. 

 Pure instinct is an interest so controlling internally deter- 

 mined activities reflexes, and sensori-motor actions. A 

 single sensori-motor act would fall within the limits of the 

 definition only if the interest prompting it were hereditary 

 and enduring. In point of fact, all instincts of any high 

 degree of development involve a combination of many 

 such acts. Instincts may also be served by intelligence, 

 in which case we do not speak of them as pure, but at 

 the point at which intelligence is able to grasp the entire 

 trend of action, to foresee the end, and determine the 

 means freely without reference to any hereditary pro- 

 pensity to a specific form of approach, we pass out of the 

 region of instinct and enter that of intelligent purpose. 



