A new analysis of the Bristol waters: together with the cause of the diabetes and hectic. And their cure, as it results from those waters, experimentally consider'd. ... By John Shebbeare, ...
Shebbeare, John, 1709-1788.
Page  10


THE more accurately to distinguish the Genus of the Waters, I shall consider the Phaenomena as they naturally appear. The first of which are its sparkling and whiteness in the Glass. Upon growing cold this whiteness disappears, and is precipitated to the Bottom of the Bottle in white Flakes, after being kept some Time.

Experiment I.

To the Bottom of a Glass, by means of some Wax, having fix'd a Thermometer *, it was pump'd on till the Spirits rose to the utmost from the Heat, upon Examina∣tion it was found to the Heat of Health as Seventy-seven is to Ninety-four, the Heat of the Atmosphere being at that Time Fifty-two.

Page  11

Experiment II.

To a Glass of the Water recent from the Spring was poured Syrup of Violets, and it became green; with a Solution of Silver in Aqua fortis, Sugar of Lead in common Wa∣ter, Oil of Tartar per Deliquium, it turn'd milky and precipitated. Quicksilver dissolv'd in strong Spirit of Nitre, turn'd yellow with the Hot-Well Water; with a Solution of Sublimate in Water, Spirit of Hartshorn, and Tincture of Steel, the Water continued tran∣sparent. With Oil of Vitriol a brisk Agita∣tion and Effervescence arose, with Galls no Difference.

Experiment III.

In order to know whether there were any Spirits escap'd from the Waters in cooling, I fix'd a Receiver to a Retort, and well luted the Juncture; then thro' a Hole made in the Crown of the Retort, by a Glass Fun∣nel the Retort was fill'd with Water as it ran warm from the Spring; the Hole then being stopt, I waited to see if there would any Spirit come over into the Receiver: In all the cooling there appear'd not the least Eva∣poration or Dew, and if there was any, it Page  12escaped like Light thro' the Pores of the Glass, a Thing scarce credible.

Experiment IV.

The Bristol Water examin'd statically, and compared with Rain Water receiv'd very pure on an Eminence, scarce differ'd from it in weight, it was ten Grains in a Pint lighter than common Spring Water.

Experiment V.

Having distill'd five Gallons of Bristol Water from a clean Glass Retort, in a gentle Heat of Sand, there remain'd 280 Grains of a whitish Salt Powder, and consequently 7 Grains to a Pint, now a Pint containing 28⅞ Cubic Inches, and a Cubic Inch weighing 253 2/10 Grains nearly, the Water is to the Residuum as 7310 to 7, or 1044½ to 1.

Experiment VI.

Two Drams of the Remains being dis∣solved in Water and filter'd, the Salt was found after Evaporation, to the Earth as eleven to thirteen, with another Solution of the Remains after Filtration, all the Ex∣periments were repeated that were made by different Menstrua at the Well. The Dif∣ference Page  13was, that Syrup of Violets did not turn green, nor the Solution of Mercury yellow, but Spirits of Hartshorn became milky, and Oil of Vitriol discover'd no Ef∣fervescence.

Experiment VII.

Another Part of the filter'd Solution was evaporated till a Pellicle appear'd, and then was placed in a cold Cellar that the Salts might shoot: After a few Days the Glass was cover'd with Crystals, which being exa∣min'd by a Microscope appear'd octogonal, interspersed with cubical ones.

Experiment VIII.

Having separated the octogonal Crystals from the Square, I put them in a Crucible on the Fire, at first they melted, then dry'd and blister'd, and became white, after taking off the Crucible there appear'd a light spongy Substance, acrid to the Taste.

Experiment IX.

The Salts obtain'd from an Evaporation of the filter'd Solution were put into a very small Retort, and then pouring Oil of Vitriol on them, the Receiver was immediatly fix'd Page  14and luted, and both placed in a Sand-Heat; upon the gradual Application of Fire, there ascended a white Fume, and a genuine Spirit of Salt came over into the Receiver.

Experiment X.

To an equal Quantity of the octogonal Crystals, and common Tartar powder'd and well mix'd, I applied a red hot Iron, but there ensued no Fulmination or firing.

Experiment XI.

Upon the insipid Earth that remain'd in Filter there was pour'd Oil of Vitriol, and it raised a strong Ebullition, and with Syrup Violets turn'd green, and shew'd every Ap∣pearance of Alkalescence, upon Application of a Loadstone there were no ferruginous Particles attracted.