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A42110 New experiments, and useful observations concerning sea-water made fresh according to the patentees invention: in a discourse humbly dedicated to His Majesty, the King of Great-Britain, &c. By a fellow of the Colledge of Physicians, and of the Royal-Society. Grew, Nehemiah, 1641-1712. 1683 (1683) Wing G1956; ESTC R215167 9,260 46

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Pureness and Simplicity which still may be further confirm'd by the following Experiments Take about half an Ounce of Syrup of Violets be Dissolv'd in half a Pint of some Harsh pump-Pump-water in a short time the Water turns the Syrup to a Muddy Green Colour This I have known to happen to some Apothecaries as much to their loss as their wonder from whence it should proceed But the reason was though they took sufficient care in picking their Violets yet not in the choice of their VVater Put a few drops of Oyl of Vitriol or Spirit of Salt to the same quantity of River-water and then let the same proportion of Syrup of Violets be dissolv'd therein and it presently turns Purple But if the Syrup be dissolved in River-water alone it turns neither Green nor Purple but holds its Blew Colour perfect and so it doth the like if it be dissolv'd in Fresh sea-Sea-water Observing this I proceed to make the like Experiment with Claret-wine which I mixed with several sorts of VVater in some good quantity as I did the Syrup But without any discernable difference between them But considering that the Colour of Claret being very full and strong might require a much greater proportion of Water to over-rule it I put three Spoonfulls of Pump-water into a Flint-Glass and drop'd into it not above seven or eight drops of Claret which being well mix'd I perceiv'd that in a little time after the Colour instead of being changed was wholly vanish'd and the Water become as Clear as before the Claret was drop'd into it The Alkaline parts in this Water destroying the Acid and therewith the colour of the Claret The same number of Drops being mix'd with the same quantity of Lambs-Conduit-Water in a Glass of the like Metal Bigness and Shape the colour in a short time did almost but not wholly vanish Mix'd in like manner with River-water it gives a few Permanent Rays of Red but Muddy as was before observ'd and is here again to the present purpose But being mixed in the same proportion and Glass with River-water Distill'd gives it a Light Clear and Permanent Hiacynthine Red. And the same Curious and Durable Red it likewise imparts to Fresh Sea-water From whence and all that hath been said before it appears To have the Clearness and Durableness of Spring-water the Lightness or Softness of Rain or River-water the Sweetness and Simplicity of that which is Distill'd And in a word all the good Qualities of the best Water without any bad one Which may serve to satisfy any Reasonable man not only to make Tryal of it but also to prefer it before any other now in use at Sea Yet because men will hardly be brought to leave a known Road though a bad one for a better unknown till they see some body go before them Therefore to discharge all manner of scruple I must not omit to add that there are several Persons of Quality and others who have Drunk often and liberally of this Water and though not much used to Drink Water yet have receiv'd no prejudice thereby And amongst them some Water-Drinkers whom I take to be the most proper Judges in the Case and who give the Character of it To be very Wholesome and that it will quench the Thirst as well as any other ordinary Water The Feazibleness of making sufficient quantities of Sea-water Fresh and the Wholesomness hereof being granted The Advantages which will arise from the use of it at Sea are very obvious with respect both to Profit and Health And first as to Profit Suppose the Voyage to be made to Surrat for which one Butt of Water for Drink alone is the ordinary Allowance for one man The quantity being always laid in not only according to the length of this or any other Voyage but also for a Reserve in case of a Calm which if it happen not they have commonly more than enough So that if we suppose a hundred men to be in the Ship they will require so many Butts for Drink Whereas if there be no Water laid in but only an Instrument to make it as there is need The Coals to work it a day and half that is to make about a Butt 126. Gallons of Fresh Water may be allowed to be something more than a Bushell which will be the most or for a hundred Butts to be about a hundred and ten Bushels So that one Butt containing fifteen Bushels a hundred and five Bushels will lie in the room of seven Butts By which means about thirteen parts of fourteen now taken up for Water will be gain'd for Stowage saving that there must be some few Cask for receiving the Water as it is wrought off from the Engine And the like computation or near it may be made with respect to any other Fewel which may also be used as well as Coal Besides which the saving the Charge of the Butts will be very considerable the Price of a Butt being twenty Shillings being bound with Iron Besides which there are other particulars relating to Profit and the preventing of Damages both at Sea and in Sea-port Towns upon which the Honourable Mr. Fitz-Gerald in his late Book doth very Pertinently insist I shall therefore conclude with the second great Advantage which will hence arise and that is in point of Health 'T is true that Thames-water when first laid in hath the repute of no Unwholsom Drink And generally though not always good care is taken in laying it in both at the best time which is at half Ebb and in case of great Tides above the Bridge sometimes as high as Chelsey And though it Ferments and Stinks in the Voyage yet grows Sweet again And as they say doth not Stink all at one time Notwithstanding which there are very few who would choose a Suspicious Water that may have Spring-water if they will or that which is as good or better if it be true which some say That in a large Voyage even some Spring-waters will Ferment a little For the mixing with Wine or any other use it would be no small pleasure to the Captain of a Ship to be sure of that which is the best And it is as a Rule among the Seamen that good Water shall be valued and go as far as Brandy when they Club together for a Bowl of Punch In point of Health peradventure while the Thames-water is in the heighth of its Ferment even the Seamen may forbear to Drink it Yet we have no reason but to believe when that is over before the Water be throughly recover'd it often goes down well enough with them who living in so Thick and Moist an Air and having their Mouths always Fir'd with Salt-Meats cannot be very Critical either in their Taste or Smell So that though the Scent and Taste of the Water with respect to the Seamen is not much to be regarded yet their constant Drinking of a Fermenting Liquor though but for some days may be of ill
mark'd the neck of one with several Degrees equally distant Immersed it in the seven following Waters wherein it sunk less or more according to the Gravity or Lightness thereof In the Pump-water in Chancery-lane a Heavy Water it hardly dips to the first or lowermost Degree In the Pump-water in Christ's-Hospital just to the lowermost In the Conduit-water in Cheapside to the second or near it In Thames-water New-River-water Water distill'd from Spring-water and in Fresh Sea-water to the third or there about So that it is as Light as common Water distill'd Neither is there any Water more Durable or Uncorruptible For all Corruption in Water sheweth it self one of these four ways either by some ill Taste or Smell or by becoming Muddy or Turbid or by gathering some Skin or Bubbles at the Top or by letting some Sedement fall to the Bottom none of all which happeneth to this Water though some of it hath been kept both in and out of the Sun for nine Months and without all doubt would continue so much longer The last mention'd quality of the best Water was its Purity that is Simpleness or Homogenity of Parts I deny not but rather contend That there is a certain Aerea● Nitre incorporated with all Water of a different nature from Nitre commonly so call'd and such as by no means yet known can be visibly seperated from the Water From hence chiefly it is I conceive that Water obtains its Cooling quality and that when it Freezes it is not because it is then only impregnated with this Nitre but because then the Air being Surcharg'd throws off a greater quantity into it As when Water is Sweeten'd or Season'd with a little Sugar it doth not follow that there is none in it because not enough to make it Candy So there is of this invisible Nitre in Water always enough to Season it though not to make it Candy or turn to Ice Now allowing this Nitre that Water which in all other respects is the most Simple is also justly to be esteem'd most Wholesom and always hath been so For as the Humours of the Eye which is the Instrument and the Air the Medium by which we discern all Colours ought to be themselves perfectly Transparent and Colourless So Water which is only a Vehicle to our Food should be it self the most Simple and freest from all manner of Qualities besides those proper to it as Water For if it be desired at any time to be Embued with any other Quality it is with respect to some Medicinal Use and not Common Diet. Now this Purity or Homogenity of Parts doth eminently belong to this Fresh Sea-water as I shall make it appear several ways and therewithall shew the Reason of its other Good Qualities especially of its Softness Lightness and Incorruptibility And first the reason of its Softness is its Purity or its being undefiled with any kind of Corrosive Salt whether Alkaline Marine or Acid. For upon Evaporating of any hard Pump-water most Spring-waters and River-waters in a Glass-Vessel or one very well Glased it is evident that the former contains a considerable quantity of Salt A Gallon from the Pump in Chancery lane which is the Saltest-Water in this City will yield near three Drachms Not of an Alluminous Salt as is commonly thought but an Alkaline with the Taste and other properties of a Lixiviall Salt That Spring-waters though they yield more or less of the same Salt yet in a far less quantity and that River-waters yield the least of all Of which three sorts of Waters the first are the Hardest the last the Softest of any in common use yet excelled by Fresh Sea-water as appears by one of the foregoing Experiments Neither is there any Marine-Salt herein For whereas half a Pint of this Fresh Sea-water or of River-water and half a Drachm of common Soap will of themselves make a very good Lather If but twelve or thirteen Grains of common Salt be added to the Water before the Soap be dissolv'd therein it will Curdle and the Lather fall like Grease upon it as if it were some Harsh Pump-water Nor yet any Acid For if you put but seven or eight drops of Oyl of Vitriol into half a Pint of River-water though you increase the former quantity of Soap yet it will never make any Lather at all Or to come yet nearer should any suspect that some kind of Spirit of Salt may come off with the Water if but seven or eight drops of Spirit of Salt be put to half a Pint of River-water it will in the same manner hinder it from making any Lather Nay if but two or three drops be put into it they will have the same effect So the reason why Fresh Sea-water as prepar'd by the Patentees is so extream Soft is its Purity or freedom from all manner of Salts save only that Aereal Nitre which is common to all Water and chiefly contributes to its Cooling quality Or if any one should be so Pertinaceous as to say that yet there may be one Grain or part of a Grain of Salt or one drop or part of a drop of Spirit of Salt should thus much be granted then in the same quantity of Thames-water there is as much or more this being a Softer Water than even Thames-water it self The Purity of this Water is also argu'd from its Lightness The perfect Dissolution of any Salt or Earth in Water in never so small a quantity adding weight to it So for Example if half a Drachm of common Salt be dissolv'd in a Pint of River-water the Water-Poise will dip no lower into it than into any Harsh Pump-water So that in a Pint of such Water there is about half a Drachm of Salt and Limy-Earth more than in River-water For although such Water be as Clear or Transparent as any Distill'd-Water yet in the Evaporation some portion of Earth is always precipitated together with the Salt So likewise if half a Drachm of Oyl of Vitriol or Spirit of Salt be put to a Pint of River-water the Water-Poise will dip therein but to the same Degree as if the same quantity of Salt had been put into it Since therefore the Gravity or Lightness of VVater dependeth upon the Dissolution of more or fewer Salt Acid or Earthy parts therein And that Fresh Sea-water is rather Lighter than River-water and as Light as any common Water Distill'd as hath before been prov'd The one is as pure and free from all kind of Salt Acid or Earthy parts as the other From whence and from its being void of any Taste or Smell 't is also easie to conclude how it is so Permanent and Incorruptible For in this Case there can be no Corruption without Fermentation nor any Fermentation where there is no Sulphur nor any other Fermenting Principles to be any way discover'd So that as the Simplicity of this Water is the reason of its Duration So this with the Premises an evident proof of its