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Still they worked with hearty good-will, gradually carrying forward their batteries, cutting their way through the soft, porous rock, and sheltering themselves from the rifle-balls of the enemy by means of gabions and stone walls.
As these bergs float southward with the currents, they melt very rapidly. The heat of the sun and the action of the waves gradually round off the sharp angles and topple down the spires that characterised them in the land of their birth. The process of dissolution, too, is carried on internally; for rain and melted water on the surface percolates through the mass, rendering it porous.
I take it for granted, however, that the inclosing cement is porous, and admits the finer parts of the surrounding fluid. The Italians call it murena; but whether it is the fish which had the same name among the antient Romans, I cannot pretend to determine. The antient murena was counted a great delicacy, and was kept in ponds for extraordinary occasions.
Everywhere the rain water, flowing over the surface or soaking through the porous mass, is conveying portions of the material which is taken into solution in a speedy manner to the sea.
With care a quarter of a pound of seed will plant an acre, when dropped directly in the hills; but half a pound is the common allowance, as there is usually some waste from spilling, while most laborers plant with a free hand. The soil over the hills being very light and porous, careless hands are apt to drop the seed too deep.
If the area over which they are thrown is large enough, and particularly if the soil is porous and well covered with vegetation, nature's filter-bed the soil, the bacteria, and the roots of the grass and other plants combined will purify a surprising amount of waste; but there is always the danger, particularly in the wet weather of spring and of late fall, that the soil will become charged with more of these waste matters than the bacteria can destroy, and that these waste poisons will be washed down in the rain water right into the pit, or trap, which has been dug for it the well.
"I didn't," said Will, "only as far as my skin. I'm not porous." They had been tacking all the time, back and forth, much to Hilda's amazement, who could not understand how that crab-like motion would ever bring them home. They were now coming past the Gurnet Lights. "We can put in there, mother, if you like," suggested Archie, "and get the mermaid dried off, if you think best."
There is some difficulty in describing the ethmoid bones; but we shall not, however, deviate far from the truth if we give the following account: A great number of small hollow pedicles proceed from and form around the cribriform plate; as they move downwards, they project into distinct vesicles or cavities, smaller and more numerous behind, fewer in number and larger in front; and each of them not a simple cavity, but more or less convoluted, while the long walls of those cells are of gossamer thinness, and as porous as gauze.
Leading lives of toil and hardship, their huts are wretched abodes built of stones and mud, their beds the ground, an iron or copper kettle hung from the roof above the fire in the centre of the cabin, a few wicker baskets, and a waterbottle of porous clay constitute their furniture.
The kennel is generally built on a sand-bed, or on a sandstone rock, while the healthiest grounds in England are on a stiff clay, and they are the healthiest because they are the least porous. Although this may be contrary to the opinion and prejudice of the majority of sportsmen, it is a fact that cannot be contradicted.
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