I taught, many years since, how to prepare the spirit of salt in quantity, whose description is also exactly set down in the first and second part of my Furnaces. It also demonstrateth its utility in Metallicks; as manifestly appears in the first part of my Mineral Work, where the manner of extracting Gold from Stones, by its help, is taught. Altho’ the spirit for that work should be prepared after another manner, than that which is to be used at Sea, or on shore, for the curing Diseases or repressing of Thirst; wherefore I’ll first teach the way of making this, and then also shew its Use.
As for the manner of anatomising Salt by Fire and Art, and transmuting it into a pure and sweet spirit, it is various, for one useth this, another way, as I also have taught divers waies, in the first and second part of my Furnaces; but here I will appoint another, which is the best and most commodious for the uses treated of in this Book, and is thus to be performed.
Get some strong Retorts, made of good Earth (but Glass is better) fill them with the following mixture of Salt and Earth, then according to Art, destil thence a spirit gratefully acid, which duly rectifie, and it will be prepared for Use. The salt is to be thus prepared for destillation: fill a great Crucible with Sea-salt, which cover with an earthen Cover, and by degrees put Fire about it of flaming Coals, encreasing it, until the salt be all over red-hot; this being done, presently remove it from the fire, and let it cool; by this means, if any greasie sordes, or other combustible impurities, adhere to the salt, they will be consumed and vanish. Dissolve the salt in common water, filter or strain it through a fine close Linen Cloth, that the fæces may be separated; the clear Liquor evaporate in an earthen glazed Vessel, till the Cuticula appear, then make little balls of clay and sand, about the bigness of Walnuts or Pigeons Eggs; dry them, and heat them red-hot in an earthen Vessel, and so the fat spirit of the Earth will be burnt away; then imbibe those balls with your strong salt water, by letting them remain in it for some hours, that they may drink in as much of it as they can, then take them out, and dry them: With these fill your Retorts, and administer Fire by degrees, and at length urge with the strongest flames, so long, till they emit no more fume, for then all the spirit is come forth: The Receiver must be of Glass, and very large, in whose bottom must also be a little water, to attract and condense the spirit. The Destillation being finished, the spirit is to be rectified by it self in a low Cucurbit in sand, and first the water or phlegm will come over, (which you may keep for another destillation) then the pure and sweet spirit will rise limpid and clear, and an unpleasant salt will remain in the bottom, which is to be cast away, and the spirit to be kept for the uses to be shewed hereafter.
But if you desire to have the spirit yet more pure, and efficacious, you may rectifie it again upon calcined or powdered Flints, which will retain in the bottom whatsoever is yet gross or impure, and the spirit will be rendered very pure and subtile; for the Flint at the first was Water and Salt, and hence both contain in themselves so streight a communion. This may be seen among the Glass-makers, who reduce Sand or Flints into clearness by melting, that thence they may make pure Glass; for Salt in the Fire dissolveth sand, Flint, Crystal, and together with them receiveth the Essence of Glass; yea, and these very species and matters, by the help of an Alkaly Salt, are resolved into a diaphanous Glass, which being put into common Water, melt like salt; of which I have discoursed in the Third Part of my Furnaces. When we destil the aforesaid rectified Spirit of Salt again from powdered Flints, from the innate love which it hath to the Flints, it carrieth some part of them upwards with it self, and is made better for use in all Diseases, especially in the Dropsie, Stone, and Gout it is an excellent Medicine. The Flints remaining in the bottom, yield a water which dissolveth the hardest Crystals, and is acid like the spirit of Salt, and nothing else but part of it coagulated with them, and may be administred in all cases as the Spirit of Salt.
Let no man wonder that I ascribe more to this Spirit rectified with Flints, than to any other common spirit of salt; for few know what Virtues are latent in flints or sand. All Birds and four-footed Animals use sand. Many men administer the powder of Flints and Crystal, for the corroborating of weak stomachs. Hens devour Sand and small Pebbles, that they may thence have matter for their Eggshels, and being debarred of it, lay Eggs without shells. Wherefore I affirm, That this spirit of Salt, abstracted from flints, to be better in many Diseases than the common spirit, and especially the Crystals, or spirit of salt coagulated, of which we have above made mention.
Let this Suffice concerning the Preparation of spirit of salt. Now we will also teach, how it is to be administred either at Sea or on Shore, for the repelling of Thirst, and the Cure of Diseases: To what other purposes the spirit of salt serves, besides Medicine, I have shewed elsewhere; here my intention is only to signifie of what great use and profit it may be in Voyages to Sea, which was the only occasion of writing this Treatise.
Of the Use of Spirit of Salt in Ships, against Thirst, and also the Scurvy.
In the first place, this spirit is profitable to the body, when a small quantity of it is put into the Hogsheads of Water, thereof Seamen and Souldiers drink, to which it gives a grateful acidity, like that of Wine, and is far more effectual in quenching of Thirst, and in less quantity than other Water, and besides preserves the Water from corruption and stinking, which otherwise in long Voyages it is wont to suffer, contracting a muddiness, blackness, and breeding Worms, which generate the Scurvy; for the Water containing the spirit of salt, cannot corrupt; which spirit also preserveth other things, both living and dead, from putrefaction. And because the water with the acid spirit of salt extinguisheth Thirst more than any other, it necessarily follows, that so great a quantity of water need not be carried for a Voyage, as otherwise is usual. Moreover, seeing that the spirit of salt resisteth all putrefaction, it suffereth not the Scurvy to take root, for it refresheth and exhilarateth a man with great vigour, corroborateth the stomach, and all the members of the body, it consumeth pituitous matter in the Reins and Bladder, expelleth Urine and Stone, keepeth the Belly soluble, promoteth digestion; it suffereth no Disease to grow from corruption of the Blood, to which otherwise Sea-faring men are subject: Moreover, it exerteth its salutiferous Virtues, if a little of it be mingled with Wine and Beer, in Ships, which will long preserve it in its goodness and sincerity, causing it the better to repress Thirst, and therefore to go the farther in use. Also Beef, Mutton, and Veal may by it be preserved a long time, viz. if they be put into stone pots, and powdered or condited with some salt, dissolved in the spirit of salt. Nevertheless it behoveth that the Flesh be without many Bones, and that all the legs, shins, or shanks be cut off. Moreover, a very small quantity of the spirit being added to the water in which Fish is to be boiled, maketh the Fish eat firm and close, and of a much solider relish than when sprinkled with Vinegar. So also Raisins being put into water impregnated with spirit of salt, will grow soft, and swell, and will recover their strength and sweetness, as if they were fresh plucked from the Vine, which will afford a great refreshment to those who frequent the Seas.
In a word, this spirit may commodiously be used, not only in Water, Wine, or Beer, but also in all sorts of Food in Ships; for it giveth a very pleasant taste to all meat and drink, and correcteth them so, that they become more wholsom. It hath also another very profitable use, viz. If in hot weather but one drop, or so small a part of the coagulated spirit, as the magnitude of an Hempseed, be mixed with sugar and held upon the Tongue; for it so cooleth the mouth, and allayeth Thirst, that there will be no need of bad Water or Beer, by which the body is more violated than corroborated, through drinking often and much of them. Nor is this the least of its virtues, that when in a long Voyage there is a want of water, a little more of the spirit of salt may be put into it than will serve for a grateful acidity; for so it will quench Thirst for a longer time, and in a less quantity than otherwise a greater quantity of water can do. Yea, although the Ship should be cast away, and the men forced to betake themselves to their Boat, or broken pieces of the Ship, as it often happens, if they have but an ounce of the spirit of salt in a Glass, or half so much of it coagulated, in defect of Drink, they may sustain their lives and health therewith so long, till it please God to afford them a means of getting to shore; nor will they be forced to drink their own Urine, or Sea-water, which is pernicious.