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Updated: May 21, 2025
The solution of chromous chloride must therefore be freed from the zinc by filtration in the absence of air. For this purpose the reduction is carried on in a flask fitted up like a washing bottle. The long tube is bent down outside the flask, and is here provided with a small bulb tube containing glass wool or asbestos.
The conclusion certainly follows from this that this process is connected with some vital function. Even if the hydathode is treated with sublimate solution, all the conditions for mechanical filtration still remain: the earth has moisture which can be taken up by the roots so that root-pressure still exists.
It is, therefore, redissolved and again thrown down by ammonia. The organic matter of the filter paper may occasion a partial reduction of the iron during solution, with consequent possibility of incomplete subsequent precipitation with ammonia. The nitric acid is added to reoxidize this iron. The use of suction to promote filtration and washing is permissible, though not prescribed.
They did not succeed in what they attempted, but they brought into vogue the natural processes of sublimation, filtration, distillation, and crystallization; they invented the alembic, the retort, the sand-bath, the water-bath and other valuable instruments.
Perhaps we may reach that happy day when, especially with improved tonometric methods, increased skill in measuring the rate of filtration and better instruments for determining the light sense, we can anticipate the advent of glaucoma and get ahead of the ocular and visual deterioration which increased tension produces, by performing preventive operations which shall aid nature's filtration channels in the establishment of an artificial one.
This plateau, at the distance of every few miles, juts out huge buttresses of perpendicular cliffs, which frown over the broken thread of green vegetation in the valley. Thick forests of palms stretch at various points along the low plain, where are springs plentifully furnished by filtration from the high ground on either hand. The various kinds of oasian culture are pursued here with success.
Silica, and graphite when it is present, need not be removed by filtration, if it is not intended to estimate them, or there be no fear that the graphite is accompanied by any humous substance, or that any oily, viscous compound has been deposited on the sides of the beaker. In the last mentioned case the solution should be transferred into another beaker, and filtered, if graphite be present.
None of the coloured ones in the aisle allows more than a filtration of light through it; there are only the plain, circular ones high up and those rich, coloured, circular ones under the dome to do the work.
After twenty-four hours the charge is taken out from the tub, and new pieces of the wood are introduced, and distillation is conducted as before. The water in the boiler must be supplied from time to time. The exhausted wood is dried and used as fuel. The camphor and oil accumulated in the trough are taken out in five or ten days, and they are separated from each other by filtration.
So that the last step of our artificial filtration is simply an imitation of nature's great filter-bed.
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