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Updated: May 21, 2025
We must wait now for a sufficient period of time and then compare the value of myotic treatment with that of operations by means of which satisfactory filtration is produced. We are somewhat in the position that general surgeons occupied when aseptic methods first became prevalent.
With this idea, the European nations, utterly benighted in comparison with the ancient Greeks, founded their transmarine dependencies. But a vast maritime distance, perhaps aided by some filtration of sound ideas, prevented the application of this theory in its nakedness and rigour to the American Colonies of England. In Ireland we had not even the title of founders to allege.
But in fact there were clouds enough floating in the sky, and soon they expanded and obscured the transitory brightness. Communication between the two continents was extremely slow; throughout the war intervals occurred when for long and weary months no more trustworthy news reached Paris than the rumors which got their coloring by filtration through Great Britain.
The novel, the Sunday supplement, the stage, the cinema screen these post-graduate courses of the working man are popularizing to-day the theories and ideals that were yesterday honoured in our secular institutions of higher education. It may take time, perhaps centuries, for this process of intellectual filtration; but ideas, like the stream, are bound to follow the incline of the water-shed.
Filtering is ineffective here, and is so generally with liquids containing matters dissolved in them. But I said "generally," and so the question is suggested Will filtration of any kind remove matters in solution? This question I will, in conclusion, try to answer.
It is probable that temperatures above 100°C. are not absolutely necessary to dehydrate the silica; but it is recommended, as tending to leave the silica in a better condition for filtration than when the lower temperature of the water bath is used. This, and many other points in the analysis of silicates, are fully discussed by Dr.
Murgatroyd slept much of the time, with his furry tail wrapped meticulously across his nose. Toward the end of the day Calhoun finished his task. He had a matter of six or seven cubic centimeters of clear liquid as the conclusion of a long process of culturing, and examination by microscope, and again culturing plus final filtration. He looked at a clock and calculated time.
In ordinary agricultural drainage, where the lines of tiles are forty feet apart, a well-laid tile an inch and a quarter in diameter is sufficient for a length of one thousand feet that is, it is sufficient to remove the water of filtration from an acre of land.
This consists of the fatty matter exuded as perspiration from the sheep, along with, or in some form of combination with, potash derived from the grass on which the sheep feed. Suint was first investigated by Vauquelin. He obtained it by evaporating, after filtration, the water in which raw fleeces had been washed. The residue is of a brown color, and has a saline, bitter taste.
He describes the operations of distillation, sublimation, filtration, various chemical apparatus, water-baths, sand-baths, cupels of bone-earth, of the use of which he gives a singularly clear description. A chemist reads with interest Djafar's antique method of obtaining nitric acid by distilling in a retort Cyprus vitriol, alum, and saltpetre.
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