502 NOISES OF INSECTS. 
bundle of muscles being alternately and briskly relaxed and contracted, will 
by its play draw in and let out the drum: so that its convex surface bein 
thus rendered concave when pulled in, when let out a sound will be pro- 
duced by the effort to recover its convexity; which, striking upon the 
mirror and other membranes before it escapes from under the operculum, 
will be modulated and augmented by them. I should imagine that the 
muscular bundles are extended and contracted by the alternate approach 
and recession of the trunk and abdomen to and from each other, 
And now, my friend, what adorable wisdom, what consummate art and 
skill are displayed in the admirable contrivance and complex structure of 
this wonderful, this unparalleled apparatus! The Grear Creator has 
placed in these insects an organ for producing and emitting sounds, which 
in the intricacy of its construction seems to resemble that which he has 
given to man, and the larger animals, for receiving them. Here is a cochlea; 
& meatus; and, as it should seem, moré than one ¢ympanum. 
Tam, & 
