formation generally takes place in the morning, and during the clear sunshine. Its improved existence is enjoyed but a short time, in comparison with that which it passed in the watery clement: the frosts of autumn destroy all of them which arc not devoured by different kinds of birds. How extraordinary! that the same creature, in its different changes, should at one time inhabit the water, and would then certainly perish if long exposed to the air; whilst, under another form, it can live only in the air, and would effectually be destroyed by submersion under the water!

The foreign Dragon-flies are very nume
rous: that of the Jibeilula Lucretia is the most
remarkable, from the extreme length and
slenderness of its body. In most of the spe
cies, the structure of the cornea, or external
coat of the eye, is most wonderful, being
marked by a prodigious number of interesting
lines, that, when examined by a microscope,
exhibit so many hexagonal ienscs of equal
convexity on both surfaces. These are each
supposed to be a distinct eye; and, according
to the computation of Leewenhoek, one only
of these clusters contains about twelve thou
sand five hundred and forty-four of these lenses!
Those dragon-flies whose wings are extended
torizontalIy when at rest, live chiefly upon
rnoihs.