SENSES OF INSECTS. 235 
perceiving sense, to the sensory, ideas of innumerable ob- 
jects. Next in rank is hearing, which can receive sounds 
from a great distance ; but the ideas it remits are confined 
only to one object, the variations of tones. In the other 
organs the sensitive power is much more confined. There 
is another difference between the intellectual and physi- 
cal senses:—the former are the only ones that receive 
and convey sensations of the beautiful and sublime; of 
harmony and discord,—the latter, though they minister 
more to our sensual enjoyments, add nothing to our 
intellectual; and therefore too devoted an indulgence 
in them debases our nature, and levels us with the brutes, 
which use their eyes and ears only for information, not 
for pleasure*. 
In man the ordinary five senses are usually in their 
- greatest perfection, although in some animals particular 
senses have a greater range. The Vertebrates in general 
are also gifted with the same number, though there are 
some exceptions. ’ But in the Jnvertebrates they are sel- 
dom to be met with all together in the same object. The 
Cephalopods have no smell. Several Gasteropods can 
neither hear nor see. ‘The animals of bivalve shells have 
neither eyes, nor ears, nor smell; and the zoophytes and 
the races below them have, it is affirmed, only the single 
sense of touch, which in them is so extremely delicate as 
to be acted upon even by light>. 
Not so our insects. These, there is good reason to be- 
lieve, possess all the ordinary senses. ‘That they can 
see, touch, taste, and smell, no one denies. Linné and 
* N. Dict. d@ Hist. Nat. xxx. 584—. 
> Cuy. Anat. Comp. ii, 362. 
