CHAP. II. The sorts and forms of Diureticks [or Medicins that purge by Urin] as also the Reasons of the Chymical Preparations of some of them.
FIrst therefore, as to Saline Diureticks [or salt Medicins that purge by Urine] that which I have oftentimes inculcated, ought to be here taken notice of, to wit, that what ever Salts of different tempers are put together, they mutually lay hold of each other, and are immediately conjoined; and that whilest they so combine, the other particles, being loosened from the mixture, divide or fly several ways. This is evident∣ly seen when fluid or acid Salt is put to fixed or alchalized; and likewise when fluid * 1.1 or fixed is mixed with volatile or sharp Salt. Indeed the whole business of Dissolutions and Precipitations depends upon this one quality of Salts. Wherefore since the Bloud and Humours of our Bodies abounds with much Salt, and that usually altered * 1.2 from one state to another, and consequently the cause of various indispositions; and seeing furthermore that there are divers kinds of saline Diureticks, filled with fixed, fluid, nitrous, volatile, or alchalized Salt, it will require great discretion and judgment in a Physician so to order it, that the saline particles in the Medicin may differ from those in our Bodies. How this may be done I will shew you by running over each kind of saline Diureticks.
Among saline Diureticks impregnated with acid Salt, the Spirit of Salt or Nitre, as * 1.3 also the juice of Limons, and Wood Sorrel, White Wine, Rhenish Wine and Cider are of prime note among the Vulgar, and oftentimes perform that intention: for these alone dissolve the Bloud, and precipitate it into Serum, as when an acid is drop∣ped into boyling Milk. But this doth not happen alike in all, nor even to any equally. In an hale constitution, or such as is not much different from it, the Salt of the Bloud is partly fixed, partly nitrous, and partly volatile; so also in some Scorbutick and Hy∣dropical Bodies, it becomes most commonly fixed. Wherefore in every of these ca∣ses, Diureticks impregnated with acid Salt, are used with success; but in Catarrhs, and * 1.4 some hydropical and fcorbutical Distempers, when the saline-fixed particles of the Bloud are exalted into a state of fluidity, and the volatile ones are depressed (as it often happens) acid Remedies usually do more hurt than good; in as much as they more pervert the Bloud, that is already degenerated from their right temper: but in such cases, Medicins impregnated with fixed or volatile Salt will be more helpful.