VARIOUS USES OF ANTENNAE. 59 



veloped, more or less deeply seated, standing iu con- 

 nection with the ganglionic cells, and so with the cerebral 

 ganglia. Even the long-necked " bottles " (Fig. 43, k) 

 may be regarded as an extreme form of this type, 

 especially if the inversion at the end can be, as seems 

 probable, regarded as a hair. 



All entomologists are agreed that some of the anten- 

 nal hairs serve as organs of protection, and others as 

 organs of touch. The evidence is, as we have seen, very 

 strong, that some of them serve as organs of smell. 

 They fulfil, therefore, at least three different functions, 

 and when we consider their manifold variety, there is 

 not only no a priori improbability, but, on the contrary 

 it seems very probable that some of them, at least, 

 perform some other function in the animal economy. 



There is, indeed, strong reason, as we sliall see in the 

 next chapter, to believe that, in some cases at any rate, 

 the antennae act also as ears; while some of these 

 peculiar antennal organs, though obviously organs of 

 sense, seem to have no special adaptation to any sense 

 of which we are cognisant. 



