LETTER XXXIII. 
EXTERNAL ANATOMY OF INSECTS. 
TERMS, AND THEIR DEFINITION. 
HAVING shown you our little animals in every state, 
and traced their progress from the~egg to the perfect 
insect, I must next give you some account of their s¢ruc- 
ture and anatomy. And under this head I shall intro- 
duce you to a microcosm of wonders, in which the hand 
of an Atmicuty workman is singularly conspicuous. 
One would at first think that the giant bulk of the ele- 
phant, rhinoceros, or hippopotamus, must include a ma- 
chine far more complicated, a skeleton more multifarious 
in its composition—covered by muscles infinitely more 
numerous—instinct with a nervous system infinitely 
more ramified—with a greater variety of organs and vas- 
cular systems in play, than an animal that would scarcely 
counterpoise a ten-millionth portion of it. Yet the re- 
verse of this is the fact; for the Creator, the more to 
illustrate his wisdom, power, and skill, has decreed that 
the minute animals whose history we are recording, shall 
be much more complex in all the above respects than 
these mighty monarchs of the forest and the flood. Of 
this in the present and subsequent letters you will find 
