88 
CHAPTER XV. 
SMELLING, HEARING, AND UNKNOWN ORGANS. 
AntenncE^ organs of Sense — To 2 ich — Structure of Ant en7ice — Oval 
Depressions and Circtilar Hollozvs — Tactile Hairs — Conoid 
Hairs — Sf?iell Hollows of Schieinenz — Highly Developed in 
Drojte — Atiditory Cavities of Hicks — Taste Organs 07i Lab- 
ruin — Unknown Organs — Labial Palpi — Taste Hollows on 
longue. 
The existence in insects of the sense of smell has 
never been denied. Bee-keepers have constant evi- 
dence that bees possess this sense very highly de- 
veloped. We have seen that bees produce various 
sounds ; it is consequently reasonable to assume they 
can also hear. 
The question frequently discussed and which has 
puzzled our leading scientists is : Where are to be 
found in insects the organs of smell and hearing ? 
There is perhaps no subject which has had more 
investigators, and the antennae have been anatomically 
examined and described, and the conclusion has been 
arrived at that, from their structure, they are cer- 
tainly organs of sense. This much is determined 
with certainty ; still, it remains to decide what is the 
character of the sensory function performed — is it 
that of smell, hearing, or touch, or of any or all of 
these combined ? 
That they are organs of touch is decided beyond 
doubt, but whether with this sense there is combined 
that of hearing or smell, or whether they convey 
