(2052 ) 
er Suromer to proceed in the tranfmigration to a Butterfly, i% a Tryal 
that we have but begun^and therefore rauft not pretend to fay any thing 
about its Event. 
The XIX. Title. 
Of the Phoenomena fi4ggefledby Winged Infefts in our Vacuum, 
When ouif Phylico-mcchanical Experiments were difpatched to the 
Prels, the inconvenient feafon of the year, and the difficulty of making 
theReceivers,! then employed, to keep out the Air for any long time, hin- 
dered me from then publifliing above a Tryal or two of what would hap- 
pen to winged Infers in our Vacuum. But afterwards being provided of 
more commodious Vefl'ells,! thought fit at feveral times to repair that 
OmiHion by various Attempts, where of the chief cnfue. 
Experiment I» 
There were taken 4 middle-fiz'd Flejh-flies^ which having their heads 
cut off were inclofedin a Portable Receiver, furnlflied 
Movemh. xith with 3 pretty large Pipe and a Bubble at the end. As foon 
about 8 a Qloc\ as the Receiver was Exhaufted, thofe Flies loft their mo* 
M night, ^'^^^ (which was not briik before-, ) an hour or two after, 
I approached them to the fire, which reftored not their 
Motion to them (but as to one of them I fufpeded it had a Languid mo- 
tion for a while j } wherefore 1 let in the Air upon them, after which in 
a very fhort time (though not immediately) they began one after ano- 
ther to move their Leggs,and one or two of them to walk •, and having 
kept them all night in a warm place, when I fent one the next morning 
to try, if they woiil lraanifeft any motion, he told me, that for a while 
they did,though,whenI afterward rife my felf, I could not perceive any 
motion in them. 
Ex ferment 2» 
About Noon we clofed up divers ordinary P/>V/,and a Bee or TVaff ^ all 
which, when the Air was fully withdrawn, lay as dead, fave 
S^ipt, II th. that for a very few minutes fome of them had Convulfive mo- 
tions in their Leggs. They continued in this ftate48 hour^, 
after which the Air was let in upon them, and not producing any 
figns of Life in them, they were laid in the Meridian Sun, but not any of 
them feem'd in any degree to recover. 
Experiment 3. 
We put a great //^y^-^ into a very fmall portable Receiver, where 
at firft it appeared to be very brisk and lively, but as foon 
3ikf,t^<f iith. as the Air was drawn out, fell on his back andfeemedto 
have Convulfive motions in her feet and Prohofcis • from 
whence fhe prefently recovered upon the letting in of the Air •, which 
being drawnput again, ftie lay as dead : but a while after, (within a 
quarter, or half an hour) I perceived,that upon Diaking the Receiver,fte 
Itirrcd up and down, (but faintly.) This was done pretty late yefter* 
night, fince whence I had not occafion to look on the Glafs, till this 
night after Supper, when I found the fly not (whileft I flayed to endea- 
vour 
