in this position is the wing vibrated
or mov'd to the lower limit, being almost arrived at the lower limit, the
hinder part of the wing moving somewhat faster then the former, the _Area_,
of the wing begins to dip behind, and in that posture seems it to be mov'd
to the upper limit back again, and thence back again in the first posture,
the former part of the _Area_ dipping again, as it is moved downwards by
means of the quicker motion of the main stem which terminates or edges the
forepart of the wing. And these vibrations or motions to and fro between
the two limits seem so swift, that 'tis very probable (from the sound it
affords, if it be compar'd with the vibration of a musical string, tun'd
unison to it) it makes many hundreds, if not some thousands of vibrations
in a second minute of time. And, if we may be allow'd to ghess by the
sound, the wing of a Bee is yet more swift, for the tone is much more
acute, and that, in all likelihood, proceeds from the exceeding swift
beating of the air by the small wing. And it seems the more likely too,
because the wing of a Bee is less in proportion to its body, then the other
wing to the body of a Fly; so that for ought I know, it may be one of the
quickest vibrating _spontaneous_ motions of any in the world; and though
perhaps there may be many Flies in other places that afford a yet more
shrill note with their wings, yet 'tis most probable that the quickest
vibrating _spontaneous_ motion is to be found in the wing of some creature.
Now, if we consider the exceeding quickness of these Animal spirits that
must cause these motions, we cannot chuse but admire the exceeding
vividness of the governing faculty or _Anima_ of the Insect, which is able
to dispose and regulate so the the motive faculties, as to cause every
peculiar organ, not onely to move or act so quick, but to do it also so
regularly.

Whil'st I was examining and considering the curious _Mechanism_ of the
wings, I observ'd that under the wings of most kind of Flies, Bees, &c.
there were plac'd certain _pendulums_ or extended drops (as I may so call
them from their resembling motion and figure) for they much resembled a
long hanging drop of some transparent viscous liquor; and I observed them
constantly to move just before the wings of the Fly began to move, so that
at the first sight I could not but ghess, that there was some excellent
use, as to the regulation of the motion of the wing, and did phancy, that
it might