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- 
moye, namely, what openings the tremulous waves 
of sound may have reserved for them in the inmost 
recesses of the antenne, 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 be 
arranged, and fitted equally for hearing, as the 
smallest bones of the semicircular canals in the 
larger animals. 
« Nothing more, therefore, is requisite in this case 
for confirming this opinion, than to show that the 
antenne are active and watchful whenever they 
are exposed to hostile and sudden sounds. 
« T have examined, by many and various experi- 
ments for several years, insects of different kinds, 
in which the size of the antenne 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. 
