1 62 Hillside. 



ability of many mollusca, such as snails, limpets and others, 

 to find their way to and from a selected site in search of 

 food. This has been termed " homing," a very happy phrase, 

 suggestive of the instinct which leads them to return, as it 

 were, to their homes. Again, the migrating power of 

 locusts, butterflies and other insects denotes a knowledge 

 of the absence of food in a given locality, and of the neces- 

 sity of seeking pastures new, in order to obtain a fresh 

 supply. The case of the migration of butterflies and moths 

 is specially striking, because the result of their action is to 



Fro. 34. SOCIAL WASP (Foliates gallica). 



benefit their progeny, and not themselves. The migrating 

 instinct in birds does not show any greater advance on that 

 of locusts, than their much higher development would 

 warrant us in expecting. 



Whilst, therefore, we may look upon instinct as the 

 application of a general inherent reasoning capacity, the 

 possession of individual reasoning power at once raises the 

 intelligence to an immeasurably higher level. It is related 

 that a wad placed in the entrance of a wasp's nest in such a 

 manner that it could only be removed in one direction was at 

 first attacked in front, then at the side ; finally, by descending 



