STE JOHN LUBBOCK ON THE ifABrrS OF AXTS. 



245 



allied insects produce a noise by rubbing one of their abdominal 

 rings against another. Landois is of opinion that ants also make 

 sounds in the same way, though these sounds are inaudible to us. 

 Our range is, however, after all very limited, and the universe is 

 probably full of sounds which we cannot perceive. There are, 

 moreover, in the antennae of ants certain curious organs which 

 may be of an auditory character. 



These consist of three parts, a small spherical cup, opening 

 to the outside, a long narrow tube, and a hollow body, shaped 



Fi-. 7. 



Another tracing showing a similar Experiment. 1, 2, 3, the direct broafl 

 lines towards A ; and 4, the complicated track made when reservoir of laryae 

 was removed to B. 



like an elongated clock- weight. They are about 10 in number, 

 and may serve to increase the resonance of sounds, acting, in fact, 

 to use the words of Prof. Tyndall, who was good enough to look 

 at them with me, like microscopic stethoscopes. Several of the 

 other segments of the antenna also contain one of these curious 

 organs. 



Dependence on Slaves. 



Huber mentions that the Amazon ants {Polyergus rufescens) are 



