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This melted rock, when it becomes cold, forms a light, porous stone, which is used for polishing. You use it in your bathroom, to rub ink off your hands. Lava stone is easily ground into powder. When mixed with soap, this ground lava becomes a useful cleaning and polishing powder."

This is what gives bread its well-known spongy or porous texture; but the tiny cells and holes in it are filled, not with air, but with carbon dioxid gas. Making Bread with Yeast. There are several ways of lightening bread with carbon dioxid gas.

On the summits nearer to Tahoe the volcanic outflows were of andesite, a rough and porous rock of dark gray to dark brown color. Lindgren says: "By far the greater part of the andesite occurs in the form of a tuffaceous breccia in numerous superimposed flows.

His frock, or tonic, ought to be of woollen material warm, light, and porous, in order that the perspiration may rapidly evaporate. The practice of some mothers in allowing their children to wear tight bands round their waists, and tight clothes, is truly reprehensible.

There is no difficulty in obtaining plenty of stone hereabouts. The chief characteristics of the buildings are their antiquity and Gothic quaintness. The air is sharp and bracing, and the climate, as is inevitable on the shallow, porous soil of the oolite hills, wonderfully dry and invigorating.

The stems are smooth, shining and hard on the outside, but inside they are porous and the pores are full of sugar sap. The sugar-cane first came from India, but the Arabs spread its cultivation as far as Morocco and Sicily; so that it is no wonder that the word "sugar" itself comes from the Arabic.

That would be in the snow, the light, vascular, porous, permeable snow, under which a human being may move, and through which he may breathe, though tons of it may be superpoised above his body, the snow that, while imprisoning its victim, also gives him warmth, and affords him shelter, perilous as that shelter may be.

The wood of this pipe must be soft and porous, and not apt to work by the action of the fire: however, to avoid its splitting, I wrap it up in two or three doubles of good paper, well pasted, and dried slowly.

Johnny's making a new one for Rex." It was one of the vexing problems of Diane's nomadic life, just how to treat Mr. Philip Poynter. It was increasingly difficult to ignore or quarrel with him for his memory was too alarmingly porous to cherish a grudge or resentment. When a man has had a bump upon his only head, held Mr. Poynter, things are apt to slip away from him.

The outside walls, built in grades with the porous, dark-red, laterite-like stone dredged from the river, are whitewashed with burnt coralline and look clean; whilst the house, one of the best in the place, is French, that is to say, pretty.