SENSES OF INSECTS. 251 
the connexion that obtains between the senses of smell and 
taste, how necessary it is that the seat of the one should 
be near that of the other, and that it really is so in all 
animals in which we certainly know its organ? ; we shall 
feel convinced that the argument from analogy is wholly 
in favour of the nose, and may thence consider it as pro- 
bable that the sense in question does reside there. Leh- 
mann seems to be of opinion, because an insect is usually 
smaller than what it feeds upon, that it makes no differ- 
ence whether it smells with its head or with its tail: but 
one would think that a flying insect would be more rea- 
dily directed to its object by smelling with the anterior 
part of the body than with the posterior ; and that a,feed- 
ing one would also find it more convenient in selecting its 
food. As to the argument,—that smell must be the neces- 
sary concomitant of the respiratory openings, and that 
there can be no smell where the air is not inspired,— 
this seems asserting more than our knowledge of these 
animals will warrant: for the organs of the other senses, 
though the senses themselves seem analogous, are so 
different in their structure, and often in the mode in 
which they receive the impressions from external objects, 
that analogy would lead us to expect a difference of this 
kind also in the sense of smell. Besides, smell does not 
invariably accompany respiratory organs even in the 
higher animals,—for we breathe with our mouths, but do 
not smell with them. Cuvier says that the znternal mem- 
brane of the tracheee being soft and moist, appears cal- 
culated to receive scents®. But here his memory failed 
him; for it is the external membrane alone that answers 
aN. Dict. d’ Hist. Nat. xxiii, 210. » Ubi supr. 
