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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.
The gorgeous East herself never showered on her kings barbaric pearl and gold with a richer hand than the city of Mexico poured out the glittering rain over the portly person of the happy G . Saturated at length with the golden flood and its foam of pearl and diamond, if, indeed, singer were ever capable of such saturation, and were not rather permeable forever like a sieve of the Danaides, saturated, or satisfied that it was all run out, he prepared to take up his line of march back again to the City of the True Cross.
The leftovers, elements of the food that can't be solubilized plus some remaining liquids, are passed into the large intestine. There, water and the vital mineral salts dissolved in that water, are extracted and absorbed into the blood stream through thin permeable membranes. Mucous is also secreted in the large intestine to facilitate passage of the dryish remains. This is an effort.
Another biological acquisition was the assurance that the circulatory system of the blood is a closed system of vessels, and that the enclosing epithelium is not permeable by non-incisive solid bodies such as vegetable microbes, and still less by rounded protozoa, which are much larger than microbes and soft in substance.
It should be a porous, a permeable bulwark, allowing of free filtration; but it should be none the less distinct and clearly recognised. Nor do I recommend an indiscriminate hospitality to all the linguistic inspirations of the American fancy. Take, for instance, the word "scientist."
Let us not forget that, in most departments of mental work, the more we revise and reconstruct our thought, the longer we inhibit its final expression, while the oftener we return to it refreshed from other interests, the clearer and more permeable for other minds it becomes, because the more it tends to express itself in terms of willed action, which is "the language of complete men."
The phenomenon is evidently connected with diffusion. If water is very carefully poured on to alcohol, the two layers, separate at first, mingle by degrees till a homogeneous substance is obtained. The bladder seems not to have prevented this diffusion from taking place, but it seems to have shown itself more permeable to water than to alcohol.
It was certainly very curious and beautiful; evidently a huge cavity out of which the calcareous sand had been washed or dissolved, and whose walls, still to a certain extent permeable, had been hardened and petrified by the constant percolation of water charged with carbonate of lime.
Geologists hold that the deeply cut bays of Sabbioncello and Gravosa, as well as of the Bocche di Cattaro, and the step-shaped sinkings of the northern and eastern limestone mountains towards the Adriatic basin are signs of the tearing away of the islands from the mainland, perhaps through the destruction of the permeable strata.
In a breathtakingly short space of time, national borders, already under assault, became permeable, with the result that vast sums now pass instantly through them at the command of a computer signal.
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