mi) 
to be reftored again into a (freight line • This fie illuftratcs 
by that fubflance, call'd Cwm Lun£, which is nothing elfe, 
but Silver, whofe texture is changed by the particles of acid 
Spirits, which is fufible at a Candle, and fequacious, and may 
be reduced into fmall leaves* tranfparent, and fomewhat obe- 
dient to the Hammer. Farther , having taken notice that 
Glafs is a very brittle body, becaufe the furfaces, according to 
which its particles touch one another, are exceeding fmall 5 
he excites Mens curiofity, to labour after a way, whereby the 
parts of Glafs maybe comminuted into fuch fmall parts, as 
to touch one another in many points, and that then malleable 
Glafs will not be hard to make: Ail which he concluded 
with examining Dr. Merrets Arguments , produced by him in 
his ArsFitraria Englifhed ; defiring that it may be made out^ 
how the different figures of the Salts and Sands can remain un- 
changed by the violence of the Fire? 
Befides, he relateth to have reduced Venice- glafs into an 
AleM^nd upon pouring hot diftilled water upon it, drawn a 
fmall quantity of Salt out of it, not a hundred part of the bo- 
dy of the Glafs) of an unlike Figure to the Salt, which en- 
tred into the compofition. 
He examins alfo, whether common Salt may be changed in- 
to Vitriol, Alum, Niter. Some (among whom is Kirckr) 
efteeming that the common Salt, according as 'tis varioufly 
tinged by Minerals, is fometimes converted into Nifcer, fome- 
times into Alum, fometimes into Vitriol, and yet may be re- 
duced into common Salt again, But our A uthor finds not 
this in Laboratory's, but that Niter by a flaming fire degene- 
rated into an acid liquor 5 being burnt by coals, into a Lixi- 
viat Salt highly different from the nature of Common Salt 5 
if heated with Sulphur by an intenfe Fire, blown with Bellows 
in a clofe Veffel, into Stone ? but hitherto by no art into com- 
mon Salt. He thinks, Kirckr has been deceived by this, that 
the Spirit of Niter being poured on Salt, maketh Cryftals 
again in the appearance of recover'd Niter: But he faith, that 
this efculent Salt feems to be Niter, but is not. Vox, faith he 7 
that any Niter refuits thence, is not to be affign'd to the Salt, 
but the Spirit of Niter, i. e. to the attenuated particles of 
S f ff Niter, 
