ABIDING CITIES 197 



necessary for their habits. But in the class of 

 workers it has been found more useful, on the 

 whole, to concentrate attention on smell and on 

 strength of jaw than on sight and flight : the 

 important point is that the worker ant should be 

 able to find scattered foodstuffs, and should be 

 strong enough to pull them back to the city. So 

 in No. 8 you get a front view of the head of the 

 common Garden Ant ; and you will see for your- 

 self that its eyes, when compared with the nume- 



NO. 9. BACK VIEW OF HEAD, WITH JAWS OPEN, AND ORGANS 

 EXPANDED. 



rous eyelets and large compound organs of the 

 wasp, are relatively imperfect ; while its antennae 

 are large and fully developed appendages. They 

 turn in a beautiful ball-and-socket joint, which 

 enables them to move freely in every direction. 

 Now, these antennae quite clearly serve several 

 most important uses in ant life. They are the 

 organs of speech in ants, as well as the organs 

 of a special sense ; just as, with ourselves, the 

 mouth is used equally for tasting and talking. 



