NERVES SENSES : SMELL. 307 



their existence might be presumed from the existence of 

 luminous properties in certain species, or by the emission of 

 sounds in others. In like manner the discharge of nume- 

 rous and varied scents by many insects, induces us to admit 

 the sense of scent in insects, although the organ of this 

 sense is as little ascertained as that of hearing. Thus the 

 disgusting odour of the bug, the cockroach, or the lady- 

 bird; the rose-like scent of the cicindela; the musk-like 

 scent of the musk-beetle ; the garlic scent of many andrense ; 



The Musk Deetle (Cerambyx motchatut}. 



the goat-like scent of the caterpillar of the goat-moth, or 

 the strong acid smell of many of the ants, sufficiently prove 

 a keen perception of effluvia in insects. As to the organ of 

 this sense, the majority of naturalists Baster, Lehmann, 

 Cuvier, Dumeril, Audouin, Strauss-Durckheim, and, to an 

 extent, Burmeister, from analogy with the vertebrated ani- 

 mals regard the lining of the spiracles as exercising this 

 function; whilst Christian, Reaumur, Lyonnet, De Blain- 



