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The taste of sugar of lead is not the sum of the tastes of its component elements, acetic acid and lead or its oxide; nor is the color of blue vitriol a mixture of the colors of sulphuric acid and copper. This explains why mechanics is a deductive or demonstrative science, and chemistry not.
It is stated by Pereira, that a little sulphuric acid or hydroferrocyanic acid passes to the outer vessel, but probably the amount would be of no consequence for electro-metallurgy, otherwise, it might be as well to use a Woulfe's apparatus, and discard the salt formed in the first vessel.
Water slightly acidulated with sulphuric, nitric, or muriatic acid will probably be the best, but it is hoped that phosphoric, acetic, and lactic acids will prove equally good. Lemon juice and vinegar are merely acetates and citrates of potash, and are not as good. It seems that the offensive smells noticed in the English Houses of Parliament last session have been traced to their source.
In many well-lighted libraries, the heat itself from the numerous gas-burners is sufficient to injure them, and there is besides a sulphuric acid escaping from the coal-gas fluid, in combustion, which is most deleterious to bindings. The only remedy appears to be, where libraries are open evenings, to furnish them with electric lights.
Does the black fetid mud, abounding with organic matter, yield the sulphur and ultimately the sulphuric acid? Two days afterwards I again rode to the harbour: when not far from our destination, my companion, the same man as before, spied three people hunting on horseback. He immediately dismounted, and watching them intently, said, "They don't ride like Christians, and nobody can leave the fort."
From the solution thus obtained, sulphurous acid pure enough to be used for the manufacture of sulphuric acid, sulphur, and a solution of green vitriol is made. Experiments with this process are making at Freiberg and at the Rhenania Works, near Stolberg.
The second half of the filtrate is used for determining the small quantity of sulphate of lime still contained in the hydrochlorate solution. By adding chloride of barium solution the sulphuric acid is bound to the barytes and sulphate of baryta separates as white precipitate. This is separated by filtering, washed, dried and weighed in the customary manner.
More gas can be generated by adding more dilute sulphuric acid to the hypo until the latter is decomposed; then it should be thrown aside, and a fresh charge put in the bottle.
When cotton fiber is soaked in a large excess of a mixture of the strongest nitric and sulphuric acids, gun-cotton proper, or that of the highest grade, is produced. When weaker acids are used, lower grades of nitro-cellulose are formed. The first mentioned or highest grade gun-cotton, when thoroughly freed from its acids, has always proved to be a perfectly stable compound.
At their best they could not now hope to reach the relief camp before nine o'clock and after dark. Mrs. Buck came with a huge pot of coffee for all, and then followed the last step. One by one, borne on the shoulders of the curious workmen, the dangerous carboys of sulphuric acid were emptied into the generating tanks.
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