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CHAP. LXIIII.
Generall precepts about the distilling of Waters.
AFter that the matter is in this manner and fashion prepared (as we haue said) there remaineth nothing more to be done, but the putting of it into the Stillitorie: and herein you must carrie your selfe very wisely and discreet∣ly, in obseruing certaine generall precepts for the ordering and directing of the whole worke vnto a good and perfect end.
First prouide, that your furnaces be set in such a place, as where they may not en∣danger the setting of your whole house on fire; as that they also may not be subiect to haue any thing to fall vpon them.
If you distill Quicksiluer, or any other such thing which hath a venimous malig∣nitie, come not neere vnto your Stills all the time of the distilling of such matter: for the smoake or fume which at that time they breath out, doth draw vpon a man the Palsie, exulceration of the Lungs, Lethargie, or oftentimes sudden death: as you may see by experience in such as are Plummers, and employed in melting of Mettals.
If you distill in Glasse vessels, you must make choice of such as are well baked and seasoned, hauing no bubbles or knots, but equall on euerie side, and smooth, thicke, and proued before hand.
The coales must be throughly kindled and halfe burned before you put any thing into the Still, that so the fume, or yet any other noysome qualitie of the coales, may not remaine to breath vpon it: or, at the least, put some few ashes or small quantitie of sand betwixt the Still and the furnace, that so the coales may not infect the water with the smoake. Likewise the fire is not to be made with wood halfe rotten, or that stinketh, or with charcoale burned and made in a pit, or of coale drawne and dig∣ged out of the earth, whether they be of stone, or earth, for feare the stilling ves∣sels and water should be infected and marred with the filthie and stinking vapour thereof.
The fire must not be hastie or headlong at the beginning, as well for the safetie of the vessels, which might thereby be broken, taking too sudden a heat, as also to the end, that the matter distilled may become acquainted with the fire by little and little, and that so farre, as vntill the fire be come to the third degree, if need doe so require.
You must not put into your Stills or Limbecke too great a quantitie of matter, for so it might runne ouer, and be cast forth againe; and furthermore, that vnderneath would be parched and dried away, and that aboue would remaine as it was put in: but it is rather the safer course to shift them oft, and so by this meanes you shall haue greater store and plentie of water.
The water of Maries bath may not be hoter than the finger may endure to slay in it: howbeit, oftentimes there come things to be distilled in the double vessell, for the distilling whereof, if it should come to passe that the heat of Maries bath should not be vehement ynough, then mixe therewith some small sand, to encrease the heat of the water.
If the glasse still happen to cracke being set vpon the fire, you shall let the spi∣rits from euaporating, if you dip diuers linnen cloathes in the whites of egges vvell beaten, and applie them vpon the cracke of the glasse hot one after another: in such sort that so soone as one shall be dried like a crust, another be readie by and by to put vpon it, and so to continue.
If you distill your waters in the heat of sand (as many doe and that verie often) or of ashes, or the filings or scales of yron made in powder, the bodie of the still must be armed (whether it be of glasse or brasse, or any other matter) with verie fine ashes