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Updated: May 21, 2025
As you are well aware, numerous operators regard the Lagrange operation as superior to the iridectomy of von Graefe because they believe there is filtration through the newly formed tissue between the lips of the operative wound.
As likely to lead to a new development of industry, the processes are especially worthy of attention. The catalogue of utilities is, however, not yet exhausted; there is one more with which we bring our notice to a close. After the washing of the fibre, a great quantity of refuse membraneous substance is obtained by filtration.
By taking advantage of differences in discharge-potentials, it is possible to effect separations of a number of the metallic ions by electrolysis, and at the same time to deposit the metals in forms which admit of direct weighing. In this way the slower procedures of precipitation and filtration may frequently be avoided.
We have nothing in England to be compared to the general filtration of artistic ideas, by means of gratuitous art and technical instruction, and the opening on Sunday of all art and literary collections.
It is remarkable of this plant, that its juice, when purified by filtration, appears of a dilute yellowish colour upon the admixture of an equal quantity of rectified spirit of wine; but forms a beautiful white, light coagulum, like the finer kinds of pomatum: this proves extremely volatile; for when freed from the aqueous phlegm, and exposed to the air, it altogether exhales in a very little time.
There are several instances of the successful use of a much smaller area than is here indicated, by the use of intermittent downward filtration. The most noted success in this direction is that at Merthyr-Tydvil in Wales, a large mining town, where the allowance is only one acre to each two thousand of the population.
The use of a suction pump to promote filtration is rarely altogether advantageous in quantitative analysis, if paper filters are employed.
The prevailing view now is that the processes of filtration and secretion are both carried on by the kidneys,—that the capillary clusters in the Malpighian bodies serve as delicate filters for the separation of water and salts, while the secreting cells of the tubules separate substances by the process of secretion.
At a recent meeting of the Physiological Society, Dr. J. Munk reported on experiments instituted by him in the course of the last two years with a view of arriving at an experimental decision between the two theories of the secretion of urine the filtration theory of Ludwig and the secretion theory of Heidenhain.
In a letter to Mr. He considers that the ether accounts for the refraction of light, the cohesion of two polished pieces of metal in an exhausted receiver, the adhesion of quick-silver to glass tubes, the cohesion of the parts of all bodies, the phenomena of filtration and of capillary attraction, the action of menstrua on bodies, the transmutation of gross compact substances into aerial ones, and gravity.
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