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Updated: June 14, 2025
The man of one idea is more or less impermeable to any process of reasoning that is foreign to this idea. An Indian author has said: "You can convince the wise; you can convince, with more difficulty, the ignorant; the half-educated, never." Now no one ever convinces the elementary schoolmaster. He is confirmed in his convictions by defending, and still more by discussing them.
May it not therefore be supposed that there must exist dividing walls in which this difference of permeability becomes greater and greater, which would be permeable to the solvent and absolutely impermeable to the solute? If this be so, the phenomena of these semi-permeable walls, as they are termed, can be observed in particularly simple conditions.
Either way, my main concern then was making the correct decisions, for I rightly believed that my involvement would decide the matter, although not in the manner I had anticipated. As I looked about myself to reconnoiter the feelings of my comrades I was fruitless, for they all wore impermeable countenances, though that was itself an indicator of their resolve.
Skeptical in attitude, a cold listener, obviously impermeable to mere verbiage and affected by the logic of facts alone, he had a ruthless finger ready to poke into the interstices of a loosely-woven argument.
It becomes impossible to guarantee the reservoir remaining sufficiently impermeable, and all security disappears, notwithstanding the use of recipients very superior to those of former times, such as those lately devised by the physicists of the Reichansalt.
We now know that large areas of the Sahara are underlaid by waters which need only be brought to the surface to cover the desert around them with verdure; that most of the rain falling on the south slopes of the Atlas Mountains sinks into the earth to impermeable strata of rock, along which it makes its way far out into the desert; that where the surface is depressed so that these waters come near to it, there are wells for the refreshment of the camel caravans, and oases, blooming islands of green, in the sterile wastes; and that artesian wells bring inexhaustible supplies of water within reach, so that millions of date palms have been planted along the northern edge of the desert in southern Algiers and Tunis, making these regions the largest sources of the world's supply of dates.
Yet it was not altogether a precise comparison, because, as the reader will speedily see, there were interruptions of this generally impermeable resistance, means of getting through the barrier to the material world again. But, naturally, there is a very great difficulty in expressing these unprecedented impressions in the language of everyday experience.
The whole ridge gradually became saturated with moisture. The surface soil was spongy, and rested on impermeable rock; it breathed in the damp mists by night, and breathed them out again by day, under Branchspell's rays. The walking grew first unpleasant, then difficult, and finally dangerous. None of the party could distinguish firm ground from bog.
She had deemed life good, and behold, it was not good; she had thought her dayspring was on high, and happiness had burnt into darkness like quick-consuming flax. But all was strangely quiet in her heart and mind. Nothing more that she feared could happen to her; the worst had fallen, and now there came down on her the impermeable calm of the doomed.
If there really exist partitions permeable to one body and impermeable to another, it may be imagined that the homogeneous mixture of these two bodies might be effected in the converse way.
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