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The large quantities of silex in solution required for the formation of these plants may probably arise from the disintegration of feldspathic rocks, which are universally distributed. As more than half of their bulk is formed of siliceous earth, they may afford an endless supply of silica to all the great rivers which flow into the ocean.
Pierre, however, noting here and there fragments of the Sacred Way, now turning, now running down, and now ascending with their pavement of silex indented by the chariot-wheels, thought of the triumphs, of the ascent of the triumpher, so sorely shaken as his chariot jolted over that rough pavement of glory.
They contain in solution so large a quantity of the matter which by mineralogists is denominated silex, that once allow the senses to be overpowered by repeated draughts, and in a few hours the effects which you behold will be produced.
These organs contain lime and magnesia in the bones, in the lymph of the thoracic duct, in the colouring matter of the blood, and in white hairs; they afford very small quantities of silex in black hair; and, according to Vauquelin, but a few atoms of alumine in the bones, though this is contained abundantly in the greater part of those vegetable substances which form part of our nourishment.
Moreover, in the fresh-water rotten-stone beds of Bilin, Ehrenberg had traced out the metamorphosis, effected apparently by the action of percolating water, of the primitively loose and friable deposit of organized particles, in which the silex exists in the hydrated or soluble condition.
As I have mentioned, the soundings from the great Atlantic plain are almost entirely made up of Globigerinæ, with the granules which have been mentioned, and some few other calcareous shells; but a small percentage of the chalky mud perhaps at most some five per cent of it is of a different nature, and consists of shells and skeletons composed of silex, or pure flint.
He sprang from the boat and up the bank with the expression of a whole forlorn hope storming an impregnable fortress, and spoke before the professor could ask a question. "I beg your pardon, Professor Silex," he said; "there is no mistake. He was absent, and, seeing that Miss May seemed disturbed, I volunteered to take his place. It gave me great pleasure to be of even that small amount of use."
Other forms of retinal injury from too great or too prolonged exposure to light are "moon-blindness," due to sleeping with the eyes exposed to bright moonlight, and that due to lightning a case, e.g., being reported by Knies. Silex also reports such a case and reviews the reported cases, 25 in number, in ten of which cataract ensued.
In desperation he then, by means of his knife and flint, strove to secure the ignition of a sort of sponge which grew under the rocks. He fared no better. The particle of steel, lighted by the impact of the silex, fell on to the substance, but went out immediately. Godfrey and Tartlet were in despair. To do without fire was impossible.
Some of our compounds for producing fertility may perhaps be as absurd as it would be to give muriatic acid to a man troubled with indigestion, because free muriatic acid is found in the stomach of a healthy person. Let me recommend you to try both silex and magnesia in a soluble state, and I think you will be satisfied with the benefit derived from their use.
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