iiB i Treatise 
and Extra# are prepared after the following Man- 
ner. 
Take of fine Filings of Guaiacum q. v. Put 
them into a Matrafs, and pour upon them 
the pureft re#ified Spirit of Wine to the 
Height of three or four Fingers Breadth above 
the Wood. Let them digeft in a gentle Sand- 
Heat for eight Days and Nights •, after which 
the red Tindture may be carefully feparated 
and put by for Ufe : Or being diftilled with 
a flow Fire to the Confidence of a thick Ex- 
tra#, and then evaporated to Drynefs in a 
Water-Bath, or the Heat of the Sun, theMafs 
remaining will be a refinous Extra#. 
ThisTin#ure and Extra# are accounted dia- 
phoretick and fudorifick. The Tin#ure is pre- 
fcribed to jj. and the Extra# from gr. iv. to Bij. 
The Spirit and fcetid Oil are prepared thus. 
Take of the Filings of Guaiacum q. v. Put 
them into a Retort, to which let a large Re- 
ceiver be fitted, and then diftil in a rever- 
beratory Furnace, beginning with a flow Fire 
and increafing it gradually to the higheft De- 
gree of Heat, till no more Drops and Clouds 
come over into the Receiver. When the 
Veftels are cool remove the Receiver, and 
carefully feparate the thick and black Oil from 
the Spirit : This Spirit is of a red Colour, 
but being diftilled a fecond Time from a Glafs- 
Alembick, is obtained limpid, purified of its 
Oil, and of a fubacid Tafte ; yet after {land- 
ing a few Weeks it becomes red again, from 
a latent Sulphur which is {till contained in it. 
The 
