So also is it with Salt, which would freely exercise the Gift bestowed upon it by the Almighty Creator, were it not hindred by its terrestrial fæces; therefore this impediment is not to be attributed to salt, but to the intervening fæces, which hinder its salutary virtues. If it were in our power to remove those thick Clouds from the sun at our pleasure, as it is to separate the earthy fæces from Salt, we might every year make our selves a very commodious Summer, which nevertheless cannot be done, seeing that God the great Pater familias, hath reserved this alone to His own Power.
As for the signature of Salt-petre, that certainly is very unequal, by reason of the great diversity of this Salt, arising hence, that it is well or ill purged, is defiled with more or fewer fæces, or other strange salts. The Common, which is required for the making of Gun-powder, is never perfectly pure, but alwaies mixed with other Salts, which cannot be separated from it by the accustomed and usual manner of solution and coagulation: Hence also you shall find no salt-petre, which can have that true and genuine signature, which God and Nature hath given it.
For by whatsoever vulgar labour and pains the Salt-petre which is got out of Stables, is purged by Solution and Coagulation, it is yet impossible that it should obtain its due cleanness and signature. But to acquire that, it behoveth to use the following Operation.
First, some pounds of Salt-petre are to be taken, which are to be purged by Solution and Coagulation, and that to be so of ten repeated, untill it acquire that purity which it is wont to admit by this vulgar Operation. Being so cleansed, it is to be divided into two equal parts, and one of them to be mixed with white Potters-earth (or Tabaco-pipe-clay) of which little Balls are to be formed, to be dried in the Sun, and put into a Glass Retort well coated, or an Earthen one which will hold the spirits, that the pure spirit of Nitre may be Elicited by Distilation, and received in a large Glass adjoyned to the Retort, containing some Water, into which the spirit entreth freely. The other part of the cleansed Salt-petre, being put into a Crucible, is to be reduced into a fiery fixed Salt, by the casting in of Charcoal, Tartar, or the Stellate Regulus of Antimony, then to be dissolved in rain Water, and filtred through brown Paper: So much only of this Liquor of fixed Nitre, is to be poured drop by drop to the distilled Spirit of Nitre as will suffice for the fixing it. This Operation stirreth up a great noise, hissing and bubling, which ceasing, admonisheth to leave off pouring in any more, and indicateth that those two contrary Natures, to wit, the acid spirit, and fixed liquor of Nitre have mutually satiated one another, and the corrosive spirit hath lost its corrosive nature, and the fixed fiery liquor its fiery quality, both returning to the pristine nature of Salt-petre. From this liquor, the Glass being imposed in sand, the unprofitable Phlegm is to be distilled off so long untill a Cuticula or thin skin appear at the top of the matter, the sand being cold, the glass is to be taken out, and set in a cold place, and let stand for one night to shoot into long and sharp Chrystals, to be freed from the rest of the liquor, by pouring it off. This liquor is again to be freed from its unprofitable Phlegm by distillation, and again to be exposed to the cold to Chrystallise. Whatsoever shall remain after every Operation, is again to be Evaporated in sand, till the Cuticle appear, and to be reduced to Chrystals in the cold, which Chrystals may be used as common Salt-petre. The Chrystals of the two first Operations, are once more to be dissolved in Rain Water, Filtred, Evaporated and again Chrystallised, which are now white as snow, and extend themselves into length, thin, sexangular, and so equal, as if they were smoothed with a Plain: For not the least roughness or unevenness is to be seen in their superficies, but they Exhibit the true and natural signature of Salt-petre. If any one shall be desirous of bringing this Salt yet to a higher purity, he may again divide this purified Salt into two parts, and from one draw the Corrosive spirit by distillation, and fix the other with Coals, and destroy both by Commixion, repeating the Operations as we have already taught, he will prepare a Salt-petre far more Excellent as well in Chymical as Medicinal Operations, as is manifest in many places of my writings.
If you Operate rightly all the Chrystals, none excepted, will be straight, sexangular, and equal in length, without any roughness, or unevenness, which is the true and genuine signature of well purged Salt-petre.
NB. The fixed liquor of Nitre, being left in the Air for a long time, and afterwards Evaporated to a Cuticle, shooteth into small Chrystals, representing the Effigies of Stars, whose figure appeareth in a rotundity so neatly and pleasantly Constituted, that those six Rays proceeding from the little body in the center or middle, seem to be most exactly disposed and distributed to an equal distance and length, as in a circle. Truly it is an admirable and stupendious work of Nature, and a signature very unlike to the former, in as much as the six Angles of this, are comprehended after a Circular manner, but in the other they extend themselves only in length and sharpness. Those things which we have here delivered concerning the true signature of common Salt, and Salt-petre, the same are also to be understood of the signature of other Salts, which must be free from all their sordes and fæces, before they can shew forth their true signature.
Vitriol and Alum, which always shoot in a knotty and uneven Figure, after they have laid aside their defilements, exhibit clear and pellucid Chrystals, which yet will be much clearer it purged by several Operations. Yea, being reduced to their highest purity, they put on a Cubical figure like common Salt, nevertheless in Elegancy, Beauty and Pleasantness, giving place to that. Hence it is manifest, that nature is always ready for the gracing and adorning of her own fruit, if a helping Hand be afforded her by Art.
Before I put an end to this Treatise of the signature of Salts, I think it fit to point out in what degrees of Dignity, those two Words Sol and Sal differ, and are distinguished.
The word Sol, containeth two Circles and the half part of a square, O. is a whole Circle; S. hath two semicircles, which being conjoined, make an entire Circle; this being cut in the middle, and the half of the section turned upwards, towards the right hand, and the other half downwards, towards the left; giveth two semicircles forming the Letter S. L. is the half part of a square.
The word Sal hath only one Circle, to wit, the Letter S. consisting of two semicircles: Also one square, constituting the Letters A and L, which argueth that the good which is in Salt is partly tempered with the other Elements, and partly combined with Earth. The Sun far exceedeth Salt in purity, nevertheless it is not absolutely perfect because the Letter L containeth the half of a square, which sheweth that it cannot be endowed with an absolute and perfect purity, neither is it as Telescopes at this day demonstrate, by whose help those solar spots have been observed in those times. Neither also ought it to have an absolute perfection, the which belongs only to God, and not to any creature, in the number of which is the Sun: Nevertheless that he is the purest of all creatures, there is no Man dare deny. Hence it came to pass, that the ignorant Heathens, attributed to the Sun Divine Honour, thinking that besides the created, there was as yet another uncreated Sun; That is, the Omnipotent God himself, the Creator of the Elementary and shining Sun, which according to the Words of Christ shall also perish at the end of the World. By a like reason there is a twofold Salt, viz. one Eternal, Divine and Celestial; the other Terrestrial and fading. And as the Holy Spirit proceedeth from the Eternal Light, and Divine and Celestial Salt, for the warming and enlightening the Hearts of Men involved in darkness and for the defending our souls against the crafts and deceits of Satan; so also from the Elementary Sun or Fire, and the Terrestrial Salt, proceedeth that most noble saline spirit for the strengthening of humane Bodies, defending them against various Diseases, and preserving them in good Health. Therefore there is an Eternal and Divine Sol, a Celestial Sal and Holy Spirit; and also an Elementary, frail Sun, Salt and Spirit. But it is our Duty to Love, Praise, Honor, and Adore the Eternal Sun, and to him to commend the health of our souls. And to use and enjoy temporal and fading things for our necessities, with thanksgiving.