C 5^53 ) 
To thislie adds another great ufe of Digefiimuy in duly pre- 
paring the Ejjences of Mineral Sulphurs 5 iqltancing by an expe- 
riment made upon Cor^//^ as mott clearly of all reprefenctng 
that great power of Digeftions, ||£J:ouxedjh£pJ^ 
agc_gj3gxnfragmeDt$^ Coral an Qyl, wh ich among: sjl 
dife iited V^egetabies is^ as far as he knows, t he mildeit ^ defi/ 
rous to try, whether he couTdRxcradTa Tiofture therewith. 
But finding after a long time no change at all in the Coral nor 
OyK i^*^ by all thoughts bf it. But having one Winter o- 
ther things to digeft in a digefting Furnace, he thought good 
to re fame that Corallin Operation, and to give the Bolt-haad^ 
wherein that matter was yet contain d,a place therc^ not with- 
out good fuGcefs^ For within a moneths time, when he ftirr'd 
it as he ufed to do, he perceived, that the bitts of Coral had a 
higher colour^, and were grown fofter^ yet without any change 
in the Oyle. He therefore continued the fame degree of hear, 
and after foncie days faw, to his wonder^, That the Cprals were 
altogether diflblved into isl very red Mucilage, yet the Oyl ftilt 
fwimraing upon them in their priftin form^ without having re- 
ceived any tinware at all. He did fliake the vdTel vehement- 
ly and ofteuj to fee whether he could uirite the Oyl with the 
Mucilage of the Corals ; but all was in vain, the Oyl ftill af- 
cending when the veflel Vi^asat reft, and the Mucilage fubfi- 
ding. Whereupon he tried^ whether he could combine them 
by digeftion 5 but that alfp not fucceeding, he powred off the 
Oyl (which he found to retain almofl its former fcent and 
tafle) and powred upon the remaining Mucilage fome Tarta- 
rifedSpirit of Wine^ofwhichbya (hort digeftion it was re- 
folved into a highly red Tind:ure, 
By thefe two Experiments the Author thinks, he hath made 
it evident ^ of what value the hitherto negleded works ofDi- 
geftionare^ as alfo given a hint of the great eiEcacy there is 
in Volatil Salts, if they be fetter d, and kept from avolation,- 
Secondly^ tofliew the power and ufe of Fermentation inChy^j 
miftryjheioftances firflin a trueVolatili^ation pfsalt of tartar by 
means of the fame^ pafTing by what hefaith he hath performed 
thcrchy upon Jntimony^ Pearls, Ceral^Scc, to be comniiiiYica. 
ted hereafter, in his intended full Defcriptiou of the Opera- 
tions made in the famous Laboratory of Gottorp. He faith then, 
that to obtain the Spirit of the Volatil Sale of Tartar^ he pro- 
Fffff 2 cceded 
