IN SUMMER FIELDS. 35 



speaks out plainly for their mountain origin. 

 There are few things in nature more inte- 

 resting to notice than these constant survivals 

 of instinctive habits in altered circumstances. 

 They are to the mental life what rudimentary 

 organs are to the bodily structure : they 

 remind us of an older order of things, just as 

 the abortive legs of the blind-worm show us 

 that he was once a lizard, and the hidden 

 shell of the slug that he was once a snail. 



D 2 



