INSTINGT AND REASON. 681 



not only have feelings, intelligence, and volition, but are 

 possibly, in a very slight degree, self-conscious. The fact 

 that animals exercise discrimination in the selection of 

 food, in the choice of a flower or object of one color in 

 preference to another, in perceiving likeness or unlikeness in 

 two objects, indicates that they can exercise the power of 

 intelligent discrimination, as has been said by Mr. Gr. H. 

 Lewes :* " When there is no alternative open to an action 

 it is impulsive ; when there is, or originally was, an alter- 

 native, the action is instinctive ; where there are alterna- 

 tives which may still determine the action, and the choice 

 is free, we call the action intelligent." 



Indeed, animals Lave the principle of similarity strongly 

 developed. It is the bond that holds together the social or- 

 ganizations of such insects as live in colonies, and such fish, 

 birds, or mammals as go in schools, flocks, or herds. Were 

 it not for this mental quality some species would tend to 

 die out. 



Animals possess memory, which consists in storing up in 

 the mind the resu.lts of external imjjressions, so that they 

 are enabled to perceive the points of resemblance or differ- 

 ence between two objects, after having been out of sight of 

 them for a greater or less length of time. Bain defines 

 memory, acquisition or retention, as " being the power of 

 continuing in the mind impressions that are no longer stim- 

 ulated by the same agent, and of recalling them afterward 

 by purely mental forces." 



With the aid of memory, birds make their migrations, 

 bees and ants find their way back to their nests. As we 

 have elsewhere said, " No automaton could find its way 

 back to a point from which it had once started, however 

 well the machme had been originally wound xxp. Nor does 

 the common notion of an inflexible instinct meet the case. 

 Memory is often due to a repetition of certain experiences, 

 and experiences lay the foundation for instinctive acts ; it 

 is the sum of these inherited experiences which make up 

 the total which passes under the name of instinct, "f 



* Article on Instinct in Nature, April 10th, 187.3. 

 f Half Hours with Insects, p. 374. 



