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Updated: June 22, 2025
That the flesh or soft parts are not wholly permeable to the rays is well shown in the skiagraph i.e., a "shadow picture" of a foot.
Faujas de Saint Fond says that at first an attempt was made to construct balloons of fine, light paper; but this material being permeable, and the gas being inflammable, balloons thus made did not succeed. It was necessary to seek a material less porous, and, if possible, still lighter.
Farther, when we see the veins below the ligature instantly swell up and become gorged, when from extreme tightness it is somewhat relaxed, the arteries meantime continuing unaffected, this is an obvious indication that the blood passes from the arteries into the veins, and not from the veins into the arteries, and that there is either an anastomosis of the two orders of vessels, or porosities in the flesh and solid parts generally that are permeable to the blood It is farther an indication that the veins have frequent communications with one another, because they all become turgid together, whilst under the medium ligature applied above the elbow; and if any single small vein be pricked with a lancet, they all speedily shrink, and disburthening themselves into this they subside almost simultaneously.
We fancy it rhetoric when we speak of eminent virtue. We do not yet see that virtue is Height, and that a man or a company of men, plastic and permeable to principles, by the law of nature must overpower and ride all cities, nations, kings, rich men, poets, who are not.
He proposes to commence with the amphitheatres in which mountain torrents so often rise, by covering their slopes and filling their beds with loose blocks of rock, and by constructing at their outlets, and at other narrow points in the channels of the torrents, permeable barriers of the same material promiscuously heaped up, much according to the method employed by the ancient Romans in their northern provinces for a similar purpose.
A second fundamental ability of living tissue, and of particular importance in character, is habit formation. Habit resides in the fact that once living tissue has been traversed by a stimulus and has responded by an act, three things result: 1. The pathway for that stimulus becomes more permeable; becomes, as it were, grooved or like a track laid across the living structure of the nervous system.
Why is it not possible that the Venetians, or Martians, or whoever our invaders are, have encased themselves and their space flyer in a layer of some substance similar to the heaviside layer, a substance which is permeable to light rays only when a large proportion of ultra-violet rays accompany the visible rays?
To take, therefore, a skiagraph of a brain through two thicknesses of skull, with our present methods, is an impossibility. Even should the difficulty be overcome, it is very doubtful whether there would be any possibility of discovering diseases of the brain, since diseased tissues, such as cancer, sarcoma, etc., are probably as permeable to the X rays as the normal tissues.
They have laid it flat and permeable; ashes all of it, except the Church only, which is of stone; not so combustible, and may have uses withal. Has perhaps served as temporary lock-up, prison for the night, to some of those Frankfurt Deputations and their troublesome wailings; and may serve as temporary hospital to-morrow, who knows?
The UPPER ZONE OF FLOW extends from the ground-water surface downward through the waste mantle and any permeable rocks on which the mantle rests, as far as the first impermeable layer, where the descending movement of the water is stopped. The DEEP ZONES OF FLOW occupy any pervious rocks which may be found below the impervious layer which lies nearest to the surface.
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