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All the rocky places, as well as the lower ridge of the northern mountainous chain, are covered by a layer of volcanic rock: it is of a bluish black colour, very porous, yet heavy, and, hard, not glazed, like schlacken, and contains frequently small white substances in its pores of the size of a pin's head, which I never found crystallised.
"Experiments have been made with toads which have been imprisoned in porous rock where they could get the necessary air. They have lived for months in a stupor. In impervious rock they have died. Frozen fish can revive; bears and other animals hibernate. There are all gradations from ordinary sleep to the torpor of death.
I have no reason to doubt the accuracy of my informer, who, having lived on the spot for several years, ought to be well acquainted with the circumstance, which, if true, certainly is very curious: for we must suppose that the snow-water, being conducted through porous strata to the regions of heat, is again thrown up to the surface by the line of dislocated and injected rocks at Cauquenes; and the regularity of the phenomenon would seem to indicate that in this district heated rock occurred at a depth not very great.
It is of a porous nature, and if applied to a fresh wound will extract and absorb the poison serum. Texans swear that it "sticks" only if there be poison present does not stick otherwise. A fanciful suggestion! And yet, no doubt, the skunk does sometimes convey hydrophobia through its bite.
First, it is sufficiently tough and lasting to withstand rips and tugs and ordinary wear and tear; second, it is warm that is, it retains well the body heat; and third, it is porous, so that it will allow gases and perspiration from the surface of the body to pass through it in one direction, and air for the skin to breathe, in the other. The normal thorax.
From the cocoa-nuts, which surround every hut, and which thrive exceedingly on the porous limestone soil and under the influence of salt breezes, oil is made which is sold at a good price to the Aru traders, who all touch here to lay in their stuck of this article, as well as to purchase boats and native crockery.
The Porites resemble the Astraeans, but the pits are smaller, with fewer partitions and fewer tentacles, and their whole substance is more porous. But these also have their bounds within the sea: they in their turn reach the limit beyond which they are forbidden by the laws of their nature to pass, and there they also pause.
Fancy the humor of Voltaire, after such a week as last! 'Well; at least, our shot is off; has not burst out, and lodged in our person here, thanked be all the gods! For men are very porous; weighty secrets oozing out of them, like quicksilver through clay jars.
Even a gas-tank is nothing but a large pitcher, made of iron because iron does not break as easily as china and is less porous than clay. So are barrels and bottles and pots and pans. They all serve the same purpose of providing us in the future with those things of which we happen to have an abundance at the present moment.
These bricks are joined by mortar, which is mixed in small quantities, and must vary very greatly in its quality and properties throughout the house. In order to prevent the obvious evils of a wall of porous and irregular baked clay and lime mud, a damp course of tarred felt, which cannot possibly last more than a few years, was inserted about a foot from the ground.
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