188 ORGANS OF HEARING. 



that hearing is the inseparable companion of the 

 power of uttering sound." * 



After dilating at considerable length on this 

 subject, Bonsdorf says, " There remains only one] 

 doubt, which the diligence of an after age may re-i 

 move, namely, what openings the tremulous wave8v 

 of sound may have reserved for them in the inmost 

 recesses of the antennae, since these organs are ter- 

 minated by no open mouth ; or whether these pores; 

 and openings between the joints be concealed, by' 

 which the very tender members connecting the! 

 joints alternately may be struck, for which use these] 

 holes, invisible to the naked eye, seem clearly to bd 

 arranged, and fitted equally for hearing, as thfl 

 smallest bones of the semicircular canals in the* 

 larger animals. 



" Nothing more, therefore, is requisite in this case I 

 for confirming this opinion, than to show that the 1 

 antennae are active and watchful whenever they^ 

 are exposed to hostile and sudden sounds. 



f( I have examined, by many and various experi- 

 ments for several years, insects of different kinds, 

 in which the size of the antenna was different, and 

 such experiments, provided due care and attention 

 are employed, cannot be performed without the 

 most striking results. In proportion, also, as the 

 summer season was agreeable, and the weather 



* Field Naturalist's Magazine, i. p. 296, 



