' (1I70) 
tations: confidering that by the above mentioned Ex* 
periment it appears, that in the produ<aion of the Ice 
made in the open Air, the very Air is mixed with the 
Water. 
But of thefe and many other things the Author (faith 
the Journalift) intends to difcourfe in his Natural plito/i* 
fby^ where he means to fliew , that 'tis not neceffary^ 
there fliould be any vacuities in the Ice , and to teach, 
what is to be faid of the place deferted by the Mermf 
whether it be void of all Body ^ or only of the Air, that 
was therct. 
A Letter written to the Publf/her from York, jftfii; lo. 1670^ 
concerning a kl^d of Fly that i$ Viviparous y togtthtt mtk 
a Set of curious Inquiries about SpidcrSyanda Tdile.of the 
fiveral forts of them to he found in England, nmountif^ (i 
33. % Mr. Martyn I,ifter» 
Sir, 
"T Return you thanks for your obliging Letter of the 
third of January^ and have fent you the Vivipiirons Fl^ 
and cheSert of Inquiries you defire of me* The f/jr is 
one, if not the very biggeft^ of the harmlcfs Tribe ihac 
I have met witli in £«^/^7///; I call them ^^r/w/^//; beca^fe 
thatthey are without that hard Tongue orSring in die 
month, with which the ^^rm-kind, or G ad-fly es,trouble 
?ind offend both roan and beafts. This Fly is ftriped 
upon the fhoulders grey and black y and as it were 
ciu ckered on the tail with the fame twp colours: the 
Fcmale va^y bo. known by a redhefs,on tbe very point of 
the tniL The very latter end of May 1666 , I opened 
fv veral of them , and found two Baggs of live white 
worms of a lon^ nnd round (hape, with black heads; 
they moved both in my hand.and in the un-opened Vcf- 
Cicles, backwards and forwards, as being all difpofed ia 
ih^ Cells J lengtb-way$ the body of the fera^l, like, a 
^leafl • 
■ Some fiidh thing is hinted by Aldrovandus Mbii^ dc 
