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In that tank is a porous asbestos packing saturated with acetone, under pressure. Thus they carry acetylene safely, for it is dissolved and the possibility of explosion is minimized. "This mixing chamber, by which I am holding the torch, where the oxygen and acetylene mix, is also designed in such a way as to prevent a flash-back.
In glaciers, the lines of porous ice and of minute crevices seem to be due to an incipient stretching, caused by the central parts of the frozen stream moving faster than the sides and bottom, which are retarded by friction: hence in glaciers of certain forms and towards the lower end of most glaciers, the zones become horizontal.
It should be remembered that the more yeast used, the more quickly will the necessary gas be created, and that, as has already been shown, it is the formation of gas that makes bread light and porous. In addition to flour, liquid, and yeast, 1 teaspoonful of salt, 1 tablespoonful of sugar, and 1 tablespoonful of fat are the ingredients generally used for each loaf of bread. Necessary Equipment.
The meshes are filled in by growing tissue, and as it grows the tissue absorbs part of the sponge, which is itself an animal tissue and acts like catgut. Part of it is also thrown off. In fact, the sponge imitates what happens naturally in the porous network of a regular blood-clot. It educates the tissue to grow, stimulates it new blood-vessels and nerves as well as flesh.
The driver had gone off with his pair of ponies, but Abdullah, ruefully making the best of a perplexing situation, searched under the box seat for the porous earthenware jar of water which is often carried there in the East. By good hap, he found one, nearly half full. "Here," he mattered Impatiently, "let her drink some of this, and pour the rest over her head and hands.
Such, then, was my jacket: a well-patched, padded, and porous one; and in a dark night, gleaming white as the White Lady of Avenel! "All hands up anchor! Man the capstan!" "High die! my lads, we're homeward bound!" Homeward bound! harmonious sound! Were you ever homeward bound? No? Quick! take the wings of the morning, or the sails of a ship, and fly to the uttermost parts of the earth.
Most of the drainage of the glacier vanishes at once in the porous rocks to reappear in springs in the distant valley, and it is only in time of flood that the channel carries much water; then there are several fine falls in the gorge, six hundred feet or more in height.
To my argument, That these porous strata are found consolidated with every different species of mineral substance, our author makes the following observation: "Here the difficulties to the supposition of an aqueous solution are placed in the strongest light; yet it must be owned that they partly arise from the author's own gratuitous supposition, that strata existed at the bottom of the sea previous to their consolidation;" gratuitous supposition! so far from being a supposition of any kind, it is a self evident proposition; the terms necessarily imply the conclusion.
The well-known disinfecting action of charcoal the surface of the interior particles of which equal from fifty to one hundred square feet to each cubic inch of material, and all of which surface is active in condensing oxygen is due not simply to an absorption of foul-smelling odors, but to an actual destruction of them by slow combustion, so that the same mass of charcoal, if kept dry and porous, will continue almost indefinitely its undiminished disinfecting action.
While she muttered these and similar words, she filled a graceful cup of glazed earthenware with filtered Nile-water, which she poured out of a large porous clay jar, and laid a laurel leaf, on which was scratched two hearts linked together by seven strokes, on the surface of the limpid fluid. Then she stepped out into the air again.
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