The Memory of Insects 89 



show that this class of animals possesses the 

 sense of hearing. 



From the preceding statement it is evident 

 that insects possess visuo-sensory and olfactory 

 organs, also sensory organs of touch, taste, and 

 the muscular or kinaesthetic sense; some few 

 of them have the power of hearing. Leading 

 directly from each of these receptors of energy, 

 nerve fibres pass to corresponding nervous 

 centres located in the brain. These cerebral 

 nervous centres are in intimate communication 

 with one another by means of protoplasmic 

 fibres, and the whole of this system of sensory 

 organs and cerebral centres is brought into 

 close relation with the nervous matter of the 

 mid-brain. 



That insects possess memory is demon- 

 strated by their actions. For instance, Professor 

 J. Loeb states that there was a wasp-hole in a 

 flower-bed in his front yard. Towards noon he 

 saw a wasp passing along the side walk of the 

 street in front of his yard, carrying a caterpillar 

 in its mouth ; the weight of the caterpillar pre- 

 vented the wasp from flying. The yard was 

 separated from the street by a cemented stone 



