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Updated: May 18, 2025
I had several of these envelopes prepared ready for use when I needed them. I had some tannin placed on the flap and then covered thickly with gum. On the envelope itself was some iron sulphate under more gum. I carefully sealed the letter, using very little moisture. The gum then separated the two prepared parts.
Phosphate of lime and magnesia in food principally furnish the animal with the materials of which the bony skeleton of its body consists. Saline substances chlorides of sodium and potassium, sulphate and phosphate of potash and soda, and some other mineral matters occurring in food supply the blood, juice of flesh, and various animal juices, with the necessary mineral constituents.
Now if that letter were steamed open the tannin and the sulphate would come together, run, and leave a smudge. You see the blots? The inference is obvious." Clearly, then, our chase was getting warmer. Dawson had been in Atlantic City at least within a few days.
The salt here, and in other parts of Patagonia, consists chiefly of sulphate of soda with some common salt. On returning through one of these tracts, after a week's hot weather, one is surprised to see square miles of the plain white, as if from a slight fall of snow, here and there heaped up by the wind into little drifts.
The mine consists of a hard stratum, between two and three feet thick, of the nitrate mingled with a little of the sulphate of soda and a good deal of common salt.
In the converted sea water the bulk of the solids is composed of inert citrate of soda. There is a little citrate of potash, which is a feeble diuretic; a little citrate and sulphate of magnesia, a slight aperient, corrected, however, by the constipatory half grain of sulphate of lime; so that the whole practically is inoperative.
Thus calcium chloride and sulphate are removed, and calcium sulphide, if present, is destroyed. The sulphur thus prepared is covered with water at 70 deg. to 80 deg., a few drops of ammonia are added, and the mixture is digested for a quarter of an hour. All the arsenic present as sulphide is dissolved, and the ammoniacal liquid is variously treated according to the degree of accuracy required.
For a simple saddle, or harness gall, some ointment like the following should be applied and the wound rested up: One pint alcohol in which are shaken the whites of 2 eggs; a solution of nitrate of silver, 10 grains to the ounce of water; sugar of lead or sulphate of zinc, 20 grains to an ounce of water; and so on. Or advertised gall cures may be applied.
"`Perhaps you would know it better by the name of Epsom salts! rejoined his mother, with a knowing smile. "`Bah! returned he, with a grin upon his face, `I hope it won't turn out that. But what sort of thing, then, is the sulphate of soda? "`That is the scientific name for Glauber's salts. "`Worse still! I don't think we stand in need of either. Do we, Harry?
"The archbishop, smiling to Tiroll, answered him, 'Thy master useth too high terms and words, which do better agree unto himself, for I know no mutiny or sedition like to trouble the commonwealth, unless it be by his and Don Pedro Mexia his oppressing of the poor. This water is impregnated with carbonic acid, sulphate of lime, and soda.
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