( j; 
JnExtraStofa Latin Epijile of Dr. Joel Langelot, Chief Phyfui- 
tothe Dukeoji\o\i\:tm iiowB^^nt: Wheremu reprefenudj 
that by thefe thrae chymcal Operations ^DigQfiion, Fermcntati- 
oti, TrirurCj or Grinding^{hitherto, in the Authors opinion 
rvot fiifficitHtlyTegaried) many things oj admirable ufe mny be per s 
fm med, . Efsghflid by the Publijher^ 
A Pter that this Learn d and Experienced Phyfitian and 
/^iChymift had ofren wich himfelf con(ider'd, whatthcRea^ 
funm ghr be, Why the chief Chymical Operations had been 
hithertocontemoed^and by feme reputed even forChimsera's^ 
he riE. ms to ha ve found at laft, that the true caufe thereof is' 
that the Artifts have not made ufe, as they (hould, of thofe 
means add ways, that would have made them fucceffeful, 
Nowol chofemeans heaffureth by his own certain experis 
ence thefe three to be the raoft erainent and the raoft admira- 
ble for ufe, viz. Digefttony Fcrmentationy and Triture ope- 
rations fufficiently djfcourfed of, but, in his opinion, little ut> 
derftoodas to their efficacy and ufefulnefs, wliich he here uu- 
dc rtaketh tt) make out by fome confiderable and un-common 
experiments 3 thereby to encourage thofethat are ftudious of 
Ghymiftryjand to keep themirom defifting when they fhould 
moft purfue their work, as^alfo from defpairing of the fuccefs 
cf this or that Operation though in appearance dubious* 
Hrfl: then be die ws the excellent ufefulnefs of Digeflion * in 
the Preparation of the Velatil 
Salt of Tartar, Where faa. 
ving mention'd the difficul- 
ties and unfuccefsfuinefs in o. 
therProcefles, tryed by him, 
he affures us, Thatas foon as 
he made ufe of ^i hng Digtfli^ 
on he fucceeded fo wetl, that 
the very firfttime heobtain- 
ed^ what he feared he fhouId\ 
not have gotten by many Co. 
bobatmis 5 which was^ a pure 
white Volatil Salt of Tartar, 
leaving behind a few, quite 
infipid^^iT^/ of an earthen co- 
lour, 
^ Gompareherewith, what our Noble 
mlofopher, . ^Qbert Boyh, many years 
fitice hath pubJi/h'd of the great Ufe 
of Digeftions, namely in his ^fi?ory 4 
fluidity and Fimmfsy the firft part, 
Seftion nth, printed in t'ondcn\66^, a- 
mong QXhtY Fhyftological Efays, where 
he faith: Tih Intimation J J: all add for 
the fake of Fkilofepher^^ that hardy by long 
DigeftionsC^^i/ much more if they be help- 
€d by feafot3ahly repeated Difiillations,^ in 
txaeily fioft Vefels, and a dne degret of 
heat., there may he made In the parts of ma- 
ny bodies, both Vegetable and Animal, fo 
great a change frm the Jlate of conftfltnct 
to that ofFltddity, as thofe that centering 
themfehes i^ith ordinary courfes of Chymi- 
firy, bwoe net had a peculiar curioffty for 
tryals of this nature, w ill not he foYVPardto 
expe^. Thiswas alfoprifited in Latin 
she lame year... 
