( )

ler repeatcd the Experiment, by Infufmg Altering Medicinos into the Vei tu ofthe Right Arms ot 3 Peisons. The one Lame of the Gout , the other ex-treamly Apopleihca! ; and the zd, reduc’dto Extremity by that Odd Distem-per, the Tltca Polomca. The succefs of this, as M. Hevelttts (who was theonly Person admitted to bc present at the Operation) informs me, was, Thatthe Gout) Man sound himself pretty well next Day, and Ihortly after wentto Work, it being Harvest-time, and has conrinu’d well ever fincc, leavingthe Hospital Aug. 17.16Ö8, and profesling himself Cur’d: The Apopleiticalhath not had one Paroxysme since ; and the several Lotes which the PlicaPolontca had occaiion’d, are Healed, and both thesc Peisons are able toWork.

XII. It is commonly observ'd, that when any hlood is become Cold in a oi» afi->v*ii-Di(h, that part which is beneath the Superhcies appears much Blacker, than °^Xcofi° 0 1 jjthat on the Top. S .FracaJJdti maintains, that this Blackish Colour comess^'ueafati’.from hence, that the Blood, which is undernearh, is not expos’d to the Air, "•

and not (as it is vulgarly soppos’d) from any Mixtnreof Melancholy. Toprove which, he aflures, that upon its being expos’d to the Air y it changcsColour and becomes of a Flortd Red.

XIII. Take a Quantity of Ftiings of Copper, fresh made, and place them in eE ^ e f/ 0 faGlaß Vial, whole Bottom is broad and even, and then pour on an Urinous mood ^ExfUm-iSpirit , either of Sal Armoniack, or of Unne it seif, not made with §>uick-

L’tne. 1. The Glaß should not be fill’d up much above one half-way, and chTngeVcolour

then must presentlybe so exactly llop’d rhatno.d»- becapable of intruding. ,n

You may then observe fot 4, 5, ot 6 Days the Ttnfture will be growing /.anlfAu, by

Dceper and Deeper, and then will keep a stand for 2 or 3 Days, more or Du

less, and afterwards will gradually decline until it become quite Pale, and 2 ° 4 ' P ‘ 9

void of all Colour, When it is in this state, the eafiest way of performing

the Experiment for yourown latisfaction, is rodecant this Clear Spirit into a

Glase so as to leave all the Filings behind, and that will demonstrate that

the Filings did not give this Finiture de novo, but that it belongs to the In-

fluence ofthe Air. But in case you are turnish’d with an Air-pump , and can

pour off this Pallid Liquor in a Vacuo Aeris , and there stop it up securely, you

may then prescrve it so long as you please, and exhibit it to advantage.

You may also observe, that so soon as you let in the Air, the upper Super-ficies immediately Tinges first, and so Desoends deeper and deeper until ithas penetratcd the whole, and this it does the sooner, if the Glaß be wide,and the Liquor by conscquence have a large Superficies : Or if you pour itout of one Glaß into another, the Air makes a more sodden Change of thewhole.

That this Liquor Ihould lose its Tincture is not to bewonder’d at, foreven Ink it seif by standing still will lose much of its Tincture; and so dothe Tmitures of many Minerals: Nor can we expect that there Ihould beany Precipitation diseernable at the bottom ot the Glase, if we confidet, *

that 2 Gr. of Copper will give a Deep Colour to 3 Oimcts of Urinous

H h 2 Spirit.