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A96634 The remaining medical works of that famous and renowned physician Dr. Thomas Willis ... Viz I. Of fermentation, II. Of feavours, III. Of urines, IV. Of the ascension of the bloud, V. Of musculary motion, VI. Of the anatomy of the brain, VII. Of the description and uses of the nerves, VIII. Of convulsive diseases : the first part, though last published, with large alphabetical tables for the whole, and an index ... : with eighteen copper plates / Englished by S.P. esq. Willis, Thomas, 1621-1675.; Loggan, David, 1635-1700? 1681 (1681) Wing W2855A; ESTC R42846 794,310 545

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readily thrust out of the little spaces of the Menstruum and descend to the bottom We will in this place more sparingly insist upon instances of this nature because the more full handling of them belongs to the Chymical Work Precipitation is not only observed in the separation of a more thick matter from a serous latex and in the settling of the disturbed parts towards the bottom but somtimes the Particles shut up within the pores and passages of the Liquor are so small and subtil that being Precipitated they are not discerned by the sight neither do they quickly descend to the bottom but from their situation and position being variously changed the colour and consistency of the Liquor are diversly altered I was wont in times past to sport with the solutions of Vegetables and Minerals which being made by themselves were clear like Spring water and appeared bright being commixed shewed now a Black colour now a Milky Red Green Blue or some other kind The solution of Saturn or Lead being made with distilled Vinegar appears bright like common water if you add to this Oil of Tartar like clear water the mixture straight grows White like Milk If Antimony calcined with Nitre be boiled in Spring water the straining seems clear and almost without smell which yet being dashed by any Acid thing presently acquires a deep yellow colour with a most wicked stink Common water being imbued by an infusion of Mercury Sublimate is presently tinged with yellowness by Oyl of Tartar dropped into it Quicksilver and Sal Armoniack being beaten together and Sublimated in a Matrace by the heat of Sand go into a white powder this being soluted by melting shows like to clear Spring water which yet being smeared upon Brass or Copper appears like Silver and being lightly rubbed on brasen Vessels renders them as if they were perfectly silvered A solution of Calcined Tin being put to melted Salt of Tartar becomes bluish A clear infusion of Galls being mixt with a solution of Vitriol makes Ink if you add to this Spirit of Vitriol or Stygian water the black Liquor is by and by made clear like Spring water and this Oil of Tartar reduces again to Ink. And what is more wonderful if you write on Paper with the clear infusion of Vitriol and frame any Letters what you so write presently vanishes nor is there any marks of the Characters left but if you smear over the Paper with an infusion of Galls presently the Letters may be read as if wrote with Ink which yet with a Pen run over dipt in Spirit of Vitriol you may put quite out at once wetting and then again render them with wetting them with another Liquor of Tartar The Sky-colour Tincture of Violets being dashed with Oil of Vitriol becomes of a Purple colour to which if you add some drops of the Spirit of Harts Horn that Purple colour is changed into Green Brasil Wood being infused in common water leaves a very pleasant Tincture like to Claret Wine if you pour to this a little distilled Vinegar the Liquor appears clear like White Wine a few drops of Oil of Tartar reduces it to a deep Purple colour then if the Spirit of Vitriol be poured in it becomes of a pale yellow like to Sack if you add the Salt of Lead being soluted by deliquation the mixture grows presently Milky by this means you may imitate that famous Water-drinker who having swallowed down a great deal of Spring water was wont to vomit forth into Glasses placed before him diversly coloured Liquors resembling the ideas of divers kinds of Wines for Glasses being medicated with the aforesaid Tinctures so lightly that they may not be perceived by the standers by will not only cause the water poured into them to imitate every Wine but will exhibit the very Proteus himself of the Poets changed into waters and from thence putting on all colours and infinite forms If a Reason of these kind of appearances be asked it ought to be fought in the minute Particles contained within the pores of every Liquor which as to their site and position being diversly altered by another Liquor infused transmit variously the Rays of Light many ways break or reflect them and so make divers appearances of colours For when the Rays of Light pass through almost in right Lines they make a clear colour like Spring water but it in their passage they be a little broken the Liquor grows yellowish but being more refracted they cause a red colour if they are bowed back so as to be drained or that they cannot shew themselves a dark or black colour arises but if they are again reflected to the outmost Superficies of the Liquor they create the image of Whiteness after this manner we might variously Philosophise about other colours and their appearances the diversity of which and sudden alterations in Liquids depend chiefly on Precipitation because as the Particles conteined in the Liquor are driven somtimes more near by another infusion that they clasp themselves together somtimes are ordered into other series of positions the diverse representation of colours is made For Liquor being impregnated with little Bodies or Atoms or this Nature most minutely broken seems as an Army of Soldiers placed in their Ranks who now draw into close Order now open their Files and Ranks now turn to the left now to the right hand as is diversly shown in the exercising of Tacticks or the Art Military When two clear Liquors being mixed together shall make Ink it is because the Particles conteined in either approach near one another and as it were placed in their close Orders hinder the passage of the beams of light when afterwards this Ink is made clear by another Liquor poured in it is because the new Bodies of the thing put in disperse abroad the former close joyned Particles and drive them as it were into their open Orders CHAP. XII Of the motion of Fermentation as it is to be observed in the Coagulation and the Congelation of Bodies COagulation and Congelation of Natural Bodies no less than their Solution depend only on these our Principles The improportionate mixture of these and the exaltation and powerfulness of some above others are the cause of either Spirit and Sulphur being loosned from the bond do not only pull assunder the proper Subjects but they set upon whatever is next them and where they are mighty in number and strength they affect nothing more than divorces and separations from the rest of the Principles and suffer no delay but on the contrary Salts love to be united to the rest and to be made into hard and solid substances and being destitute of the Company of the rest presently to enter into new Friendships and desire only not to be joyned to any opposite If at any time they are more impetuously moved either by their own disposition or being soluted they destroy the substance of others this thing seems to be done for this end