258 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 antennce ; in the Lepidoptera in the antlia ; 

 and in some Dipt era and Orthoptera in certain 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 respiratipn. 

 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 bronchiae 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 e . 



* Lehmann uli supr. &c. 27. 



11 Ibid, and De Usu Antenn. ii. 24. Cuv. Anat. Comp. ii. 675. 



e Lehmann De Usu Antenn. ii. 28. d Ibid. 31. Ibid. 35. 



