4 
MircRoGRAPAiAa, ¥Y2 
former, the Areaiof the wing begins to dip behind, ' and i that pofture 
feems it to be mov'd. to the upper limit back again, and thence back 
again in the firft pofture,the former part of the Area dipping again,as it ig 
moved downwards by means of the quicker motion of the main ftem 
_ which terminates or edges the forepart of the'wing. ) And thefé vibrati- 
ons Or motions to.and fro between: the two limits feem fo fwift, that ’tis 
very probable (from the found it affords, if it’be compar’d withthe vi-’, 
bration of'a mufical ftring, tun’d unifon'to it)’ it iiakes many'hundreds, | 
if notfome thoufands of vibrations in‘a fecond' mitiute of time. And, if 
we may be allow’d to ghefs by the found, the’ wing'of a Bee is ‘yet more 
fwift,for the tone is much more acute; ‘and that, itv all likelihood,’ pro- 
ceedsiftom. tlie exceeding {wift beating’ of the air by the {mall wing. 
And it feems the more likely too, becaufe the wing of'a Bee is left in pro- 
portion’ to itsbody,then the other wing tothe body ofa Fly; forthat for 
ought. I: know, it may be one of the quickeft vibrating fpontaneous moti- 
Ons of any in the worlds and though perhaps there may be many Flies in’ 
other places: that afford a yet more fhrill neife with their wings, yet ‘tis 
molt probable thatithe quickeft vibrating pomtaneows motion is to be 
found inthe wing of ‘ome creature. ‘Now, if we confider the exceeding 
quicknefs of thefe Animal fpirits that muft caufe thefe motions, we cannot 
chufe: but-admire the; exceeding vividnefs of the governing faculty or 
Anima of the Infect, which is able to difpofe and regulate fo the the mo- j 
tive faculties, as to caufe every peculiar'organ, not onely to move or ack 
fo quick, but to doit alfo fo regularly, }0 © en “0 beroqith 
» Whil'ft I was. examining and confidering the curious Afechanifor oft the 
Wings,] obferv'd.thatunder the wings of moft kind ‘of Flies, Bees, cc. 
there were plac'‘d ‘certain pexdulums or extended drops (as Iutiay fo call 
them from their refembling motion and figure) for they mtich refembled 
a long hanging drop of fome tranfparent vifcous liquor ; and T obferved 
_ them:conftantly tomove juft before the wings of the Fly began tomove, 
fo that,at the firft fight'I could not but ghefs,’ that there was fome excel- 
lent. uf,.asto the regulation of the motion of the wing, and did ee 
that it might be fomething like the handle of’ Cock, ‘which ‘by vibra- 
ting toand fro,might,as ‘twere,open and fhut the Cock,and thereby give 
a paflage to the determinate influences into the Mufcles 5 afterwards,up- 
on{ome other trials\] fuppos'd that they might be for fome ule in refpira- 
tion, which for many reafons 1 fuppofe thofe Animals to ufe, and, me 
thought, it was not very improbable, but that they might have conive- 
ic fitting; at leaft,of the air, if not’ 
nient paflages under the wings for the emitting; at tealt,or tne pene 
admitting, asin the gills of Fifhesis moft evident’ or, ‘perhaps, this Pen- 
dului might be fomewhat like the ftaff to aPump, whereby thefe crea~ 
turesmight exercife their Avalogus lungs, and net only draw eee 
out;the air they live by:2but thefe were but conjectures,and es mich i: 
examination feem’d lefs probable. od z ; F 
_ The fabrick of the wing,as it appears through a moderately magnity- 
ing AGcrofcope,feems to be a body confifting of two parts,as1s vilible in the 
4,Figure of the 23.Scheme;and by the 2.Figure of the 26.Scheme; the one is 
aquilly 
