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Updated: June 26, 2025
A little farther south two rough and barren chains of hills encompass with their dark steeps a long basin formed in a clay soil mixed with bitumen and rock-salt. The water contained in this hollow is impregnated with a solution of different saline substances, having lime, magnesia, and soda for their base, partially neutralized with muriatic and sulfuric acid.
The thickness of the beds in each salt deposit of course depends entirely upon the area of the original sea or salt-lake, and the length of time during which the evaporation went on. Sometimes we may get a mere film of salt; sometimes a solid bed six hundred feet thick. Perfectly pure rock-salt is colourless and transparent; but one doesn't often find it pure.
They were only rock-salt bullets. They didn't penetrate far. They'll sting for some time, but they're antiseptic, and they'll dissolve and absorb quickly." "Shake hands with Mr. Burke of the secret service, Professor Kennedy." It was our old friend First Deputy O'Connor who thus in his bluff way introduced a well-groomed and prosperous-looking man whom he brought up to our apartment one evening.
But the day after they reached Berber, that town surrendered to the Mahdists. Abou Fatma, the messenger who carried them, hid them in the wall of the house of an Arab called Yusef, who sold rock-salt in the market-place. Abou was then thrown into prison on suspicion, and escaped to Suakin. The letters remained hidden in that wall until Feversham recovered them.
Since that thick bed of rock-salt was first precipitated upon the dry floor of some old evaporated inland sea, the greater part of the geological history known to the world at large has slowly unrolled itself through incalculable ages. The fish-like saurians and flying pterodactyls of the secondary period have come into existence and gone out of it gracefully again.
The Abyssinians supplied the Adel with slaves, the latter returned the value in rock-salt, commercial intercourse united their interests, and from war resulted injury to both people. Nevertheless the fanatic lowlanders, propense to pillage and proselytizing, burned the Christian churches, massacred the infidels, and tortured the priests, until they provoked a blood feud of uncommon asperity.
These facts appear to me opposed to the theory, that rock-salt is due to the sinking of water, charged with salt, in mediterranean spaces of the ocean. It is worthy of notice, that the foliation of the gneiss and mica-slate, where such rocks occur, certainly tend to run like the metalliferous veins, though often irregularly, in a direction a little westward of north.
Alas for a degenerate world! even in its original site, Nature herself has taken the trouble to adulterate it beforehand. When iron is the chief colouring matter, rock-salt assumes a beautiful clear red tint; in other cases it is emerald green or pale blue.
The fine and coarse salts manufactured in Liverpool were in the proportion of fifteen tons of Northwich or Cheshire rock-salt to forty-five tons of seawater, to produce thirteen tons of salt.
The circle included nothing but a flat slate-coloured stone, with one large hole, where we had extracted the rock-salt, and one or two smaller depressions. No sign of the gem. "I've been over every inch of it," said poor Tom. "It's not there. Some one has been here and noticed the chalk, and taken it. Come home, Jack; I feel sick and tired. Oh, had any man ever luck like mine!"
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