242 SENSES OF INSECTS. 
really seven senses ; which he divides into those that 
are altogether physical, and those that are more con- 
nected with the intellect. The first of these divisions 
contains four senses, — touch, love, taste, and smell; — 
the second three, — hearing, sight, and the internal sense 
of thought, or the brain a . That he is right in adding 
love to the list seems to me evident, because it is as 
distinct from touch, as smelling and taste are. With re- 
gard to the other, though it may be expected that there 
should be a transitive sense connecting the intellect (if I 
may so speak) with the external organ of sense, and as 
a medium by which the former can receive the notices 
of the external world furnished by the latter; yet it seems 
improper to make the entire brain itself a sense. We 
know that the agent between the common sensory and 
the sense is the consciousness or perception of the im- 
pression. " Seeing we may see and not perceive, and 
hearing we may hear and not understand." The picture 
may be painted upon the retina of the eye, the sound 
may strike upon the tympanum of the ear ; but neither 
the one nor the other be received by the intellect, unless 
the internal power or faculty of perception be in action 
and mediate between them. This is what I mean by 
the internal sense, which, to use a term of Mr. W. S. 
MacLeay's b , is osculant between intellect and sense, or 
forms the transit from one group of powers to the 
other. 
Of the ordinary senses, sight holds the first rank : it 
» N. Diet, if Hist. Nat. xxx. 584. 
b Hor. Eiitomoloq. 37. 
