Vitriol, Oyl of Vitriol, and of Sulphur in some Mucilage which I tried it with, did not make any considerable Alteration when it was cold, but in some other it did more; when _Aqua Fortis_ and Spirit of Nitre did produce in all the same Effects in the same Degree. It was mighty observable, that so strong an Acid as Oyl of Vitriol should have no greater Effect upon it to alter it not, so considerable as that of Vinegar, which would incline one to think that it is not always the high Degree of Acidity that works this Change. But there seems to be something particular in Wines, which disposes them to coagulate this Liquor, when any of them are made Use of; and those Parts of them, which are apt to act thus upon it, are cast into those Interstices where they have the Mucilage singly to work upon. And therefore we find how readily any Wines do procure the Paroxysms of the Gout, where the Tone of the Glands is weakned, and the Patient hath a Disposition to this Distemper; which agrees with those Trials I have made with some of them: For Claret, white Wine, and even Sack, but the Claret especially, did make a _Coagulum_ like a Jelly; and it was not strange that Claret, which hath both an Acid and a Stypticity in it, should produce the greatest Coagulation. A mercurial Water made of Sublimate and _Aqua Calcis_, made a very considerable whitish Coagulation, and rendred it all a thick Jelly, which being held over the Fire, turned to a Curd and a _Serum_. A Solution of _Roman_ Vitriol produced a Coagulation likewise; so did Allum dissolved in Water, but it made a greater Alteration in some than it did in others, though the Mucilages were taken from subjects of the same Species. _Saccharum Saturni_ did inspissate it, which appeared to be a true Coagulation, because with the Fire they would turn to a distinct _Coagulum_ and _Serum_. Salt of Wormwood made no sensible Alteration, only it seemed a little thicker, to which I put some of the Decoction of Galls, which immediately produced a Coagulation. Upon dropping in some Spirit of Vitriol, to see what would be the Effect of the Colluctation of the Salt and Spirit, and I found, after it was over, that the _Coagulum_ and the serous Part were distinguished, and the _Serum_ limpid like Water. I took some of the Decoction of Galls, and added to it Spirit of Vitriol, intending to make a strong Acid austere, where I observed that these two by themselves produced a strong Coagulation; and stirring of them together, to see if the whole might not be brought to mix by that Means, I found the _Coagulum_ turned into a viscous Body, and a perfect soft Gum. Then I took out the Gum, and poured some Mucilage to the residuous Liquor, by which it was changed so as to assume a whitish Colour, but was not considerably coagulated; which it was the less, because the austere Parts were most of them, with some of the Acid, precipitated into the Gum which had been separated from the serous Part.