2S9 SENSES OF INSECTS. 
gular opinion. He supposes in different tribes of insects 
that different parts are organs of smell : in the Lamelli- 
corns he conjectures the seat of this sense to reside in the 
knob of the antenna ; in the Lepidoptera in the antlia-, 
and in some Diptera and Orthoptera in cevtain frontal 
cells a . At first sight, one of the most reasonable opi- 
nions seems to be that of Baster, adopted by Lehmann, 
and which has received the sanction of Cuvier b , — that 
the spiracles are organs of smell as well as of respiration. 
Lehmann has adduced several arguments in support of 
this opinion. Because we both respire and smell with 
our nostrils, he concludes that neither the antennae nor 
any other part of the head of insects can serve for smell, 
since they are not the seat also of respiration ,■ and that 
there can be no smell where the air is not inspired c . 
Again, because nerves from the ganglions of the spinal 
chord terminate in bronchia? near the spiracles, they 
must be for receiving scents from those openings. Though 
it was necessary, in the higher animals, that the organ of 
scent should be near the mouth, because they are larger 
than their food ; yet the reverse of this being the case 
with insects, which often even reside in what they eat, it 
is to them of no importance where their sense of smelling 
resides d . By exposing antennae, by means of an orifice 
in a glass vessel, to the action of stimulant odours, they 
appeared quite insensible to it : but he does not name 
the result of any experiment in which he exposed the 
mouth to this action ; nor at all distinctly how the insect 
was affected when the spiracles were exposed to it c . 
* Lehmann ubi supr. &c. 27. 
" Ibid, and De Usu Antenn. ii. 24—. Cuv. Anat. Comp. ii. 675. 
c Lehmann De Usu Antenn. ii. 28. H Ibid. 31. <•■ Ibid. 35-. 
