88 Instinct and Intelligence 



For instance, if morphia or strychnine is 

 mixed with honey, ants attracted by the smell 

 of their favourite food begin to eat the mixture, 

 but after taking it into their mouths they leave 

 the tainted honey. When the antennae and palpi 

 of wasps were removed and the animal's mouth 

 then brought in contact with honey mixed with 

 quinine, after tasting it the insect immediately 

 turned away from the honey. From experi- 

 ments of this kind it appears certain that in 

 insects the sensory organs of taste are located 

 within the animal's mouth, and consist in all 

 probability of a series of cup-like depressions, 

 connected with the terminal distribution of 

 subjacent fibres proceeding from nervous 

 centres located in the subcesophageal ganglion 

 and the mid-brain. 



Touch. The sensory organs of touch in 

 insects consist of structures similar to those 

 described as existing in Hydroids (p. 37). 

 They are scattered over the surface of their 

 bodies, and are well developed on their 

 antennae. 



Hearing. With the exception of crickets 

 and a few other insects, there is no evidence to 



