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The introduction of fresh air into a room or building in such a manner as to keep the air within it in a pure condition. Belonging to the abdominal or belly cavity. Ventricles of the Heart. The two largest cavities of the heart. Worm-shaped. The backbone; also called the spinal column and spine. Vestibule.

As the weight fell upon the step it gave way so slightly as to be almost imperceptible, but suddenly from hidden cavities around the well-like shaft there came six rings of long, sharp steel spikes, set inwards, three above and three below, which, contracting as they came forward, met and interlaced.

Then an idea came to him and he examined the glowing boxes in the coffin. They were loose, being merely set in prepared cavities in the crystal. Wrapping our handkerchiefs about his hand, he took them out and placed them around the wakened patients, a proceeding of which the Ancient nodded approval.

Their soft body, devoid of skeleton, consists of two simple strata of cells, the primary germinal layers; the outer of these is thickly clothed with long hair-like lashes, by which the parasites swim about in the various cavities of their host. The inner germinal layer furnishes the sexual products.

It was now apparent that we were near some place or places where the surf was breaking on land; and the hollow, not-to-be-mistaken bellowings of the element, too plainly indicated that cavities in rocks frequently received, and as often rejected, the washing waters.

At first, it did not exceed a foot in height above the water, but it gradually rose, like an inclined plane, and resembled in colour, and in appearance, the skulls of men piled one upon the other. The constant rippling of the water against the rock had washed out the softer parts, and made hollows and cavities, that gave the whole formation the precise appearance of a catacomb.

I shall therefore insert that given by the celebrated M. de Saussure, in his Tour amongst the Alps, of which he was one of the first and most able explorers. He says, "The word glacier designates any one of those cavities, natural or artificial, which preserve the ice, or guard it from the rays of the sun."

To heighten the general jumble and blind confusion, the echo from the cavities of the mountain represented to the Romans the shouts of the enemy as behind them: hence in some places they deserted their lines, as believing them already broken and entered: and yet such of the enemy, as broke through, were very few.

Besides this difficulty of having the water separated from the porous masses which are to be consolidated, there is another with which, upon this supposition, we have to struggle. This is, From whence should come the matter with which the numberless cavities in those masses are to be filled?

Every tone must be imperceptibly prepared, and upon the elasticity of the vocal organs depends the smoothness of the tone production. Adjusting the vocal apparatus to the high register should be both imperceptible and mechanical whenever a high note has to be sung. In the high register the head voice, or voice which vibrates in the head cavities, should be used chiefly.