be something like the handle of a Cock, which by vibrating to and
fro, might, as 'twere, open and shut the Cock, and thereby give a passage
to the determinate influences into the Muscles; afterwards, upon some other
trials, I suppos'd that they might be for some use in respiration, which
for many reasons I suppose those Animals to use, and, me thought, it was
not very improbable, but that they might have convenient passages under the
wings for the emitting, at least, of the air, if not admitting, as in the
gills of Fishes is most evident; or, perhaps, this _Pendulum_ might be
somewhat like the staff to a Pump, whereby these creatures might exercise
their _Analogous_ lungs, and not only draw in, but force out, the air they
live by: but these were but conjectures, and upon further examination
seem'd less probable.

The fabrick of the wing, as it appears through a moderately magnifying
_Microscope_, seems to be a body consisting of two parts, as is visible in
the 4. _Figure_ of the 23. _Scheme_; and by the 2. _Figure_ of the 26.
_Scheme_; the one is a quilly or finny substance, consisting of several
long, slender and variously bended quills or wires, something resembling
the veins of leaves; these are, as 'twere, the finns or quills which
stiffen the whole _Area_, and keep the other part distended, which is a
very thin transparent skin or membrane variously folded, and platted, but
not very regularly, and is besides exceeding thickly bestuck with
innumerable small bristles, which are onely perceptible by the bigger
magnifying _Microscope_, and not with that neither, but with a very
convenient augmentation of sky-light projected on the Object with a burning
Glass, as I have elsewhere shew'd, or by looking through it against the
light.

In steed of these small hairs, in several other Flies, there are infinite
of small Feathers, which cover both the under and upper sides of this thin
film as in almost all the sorts of Butterflies and Moths: and those small
parts are not onely shap'd very much like the feathers of Birds, but like
those variegated with all the variety of curious bright and vivid colours
imaginable; and those feathers are likewise so admirably and delicately
rang'd, as to compose very fine flourishings and ornamental paintings, like
_Turkie_ and _Persian_ Carpets, but of far more surpassing beauty, as is
evident enough to the naked eye, in the painted wings of Butterflies, but
much more through an ordinary _Mic