(2P49) 
pufcles of moift bodies 3 peculiar Volatility, or facility to emerge in the 
form of Steams J know, there are fome Corrofive Spirits,as in Nitre and 
Salt, fimple, or compounded of them, thar^when they are very ftrong; 
emit for a. while raanifeft fumes b|Lit the difference of thofe Liquors, 
^nd their inferiority to our red Spirit,in the Capacity of fmoaking Li- 
quors,might eafily enough be manifefted,it it were judged proper in this 
plat e, vhere it may fuffice,tG take notice of thefe two things : The w 
is^jTKat: when the Viol has lain flopped and quiet a competent time, the 
«pper half of it will appear deftitute of fumes, of which the Air, it feems, 
wiy imbibe, and confcantly retain to a certain moderate quantity, which 
may give fome light towards the Reafon^Why the fame Air,which will 
be quite clogged with fleam5,will not long ferve for llefpiration, which 
requires frequent fupplies of frelli Air The other is.That if the unftop'^d 
Viol were placed in our Vdcmm.k would not emit any vilible ftearas at 
all, nor fo much as to appear in the upper part of the Glafs it felf that 
held the Liquor whereas, when the Air was by degrees reftored at the 
ilopcock^wichout moving the Receiver it felf,to avoid injuring its ciofc- 
nefs, ^he returning Air would prefently raife the fumes, firft into the 
vacant f,ar^ <>f tlie yiol,whence they would afcend into the Capacity of 
the Receiver • and likewife, when the Air, that was requifite to fuppoic 
them, was pumped out, they ajfo accompanied it,as their unpleafant fmell 
.cv:inced,and the red Spirit, though it remained unllopped, emitted no 
-Hiore fumes till the new Air was let in. 
sGnewy conapare with this Liquor ano,therSmoakingor^e,mentioned 
:^n the 2,91^ of the firft publiflied Pneumatical Experiments, where an Ex- 
periment is related of it jthat has foraethin^ in common with this \ and 
.may fo far ferve to confirra what is now delivered , as this alfo has 
fome things additional to that: Befides that that Liquor being made with 
Ingredients Corrorive,and of a bad name among Chymifts themfelves, 
xhe fumes,^that proceed from it,may fright many from daring to meddle 
^.with it r whereas this our red Spirit lias been found potently raedici» 
nal for fome diftempers of the Lungs by a Dr. of Phyfick^, whom 1 defired 
TO try it. The other Phoenomena of this Liquor I lhall not flay to de- 
scribe as nOt belonging to this place, and the Liquor it feJf with very 
ii^cle yariati(>;nI haveiH the Hij^ory of Colmrs communicated*. 
The XVII. Title. 
Ofthehng continuance »f a Slow- worm vrwi ^ l^ttA alive in theVacmm^ 
made by our Engine 
In the often cited digreffion aboutRefpiration,there is mention made 
of the great Vivacioufnefs of Hmfe- Snails as they call them , and how 
little operation the withdrawing of the Air had upon them in compari- 
fon of what *tis wont to have on other Animals. I /liall now add by way 
of Confirmation, that I made Tryal upon ordinary Tvhite Snails withoh't 
whereof two of differing iizes (the biggefl about an Inch and a 
half, and the other about an Inch in length) were included inafmall 
portable Recciver^which beiitg carefully esjhaufted, and fccured againfl 
