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Updated: May 21, 2025
These are sunk in a stratum of gravel in which are countless cesspools, the filtration of which extends through the entire stratum and poisons every well within the limits of their influence.
This is especially apt to be the case in chronic glaucoma where the iris is adherent to the cornea, and in efforts to free the filtration angle by an iridectomy the iris is torn off in front of the adhesion and the filtration angle is not opened. As Elliot has pointed out, iridectomy is most open to attack on the ground of safety.
Now, it is to be observed, that, if the cavity in the solid limestone or marble, which is lined with calcareous crystals containing pyrites, had been thus encrusted by means of the filtration of water, this water must have dissolved calcareous spar, pyrites, and bitumen. But these natural appearances would not even be explained by this dissolution and supposed filtration of those substances.
In gravimetric analysis it is usually necessary to ignite the separated substance after filtration and washing, in order to remove moisture, or to convert it through physical or chemical changes into some definite and stable form for weighing.
You have not proposed it; and I am disposed to believe that only with a revived and improved discipline in the Church can we hope for any generally effective check upon lawless lust. 'I agree with you EMINENTLY, he writes, in a later letter, 'in your doctrine of FILTRATION. But it sometimes occurs to me, though the question may seem a strange one, how far was the Reformation, but especially the Continental Reformation, designed by God, in the region of final causes, for that purification of the Roman Church which it has actually realised?
It would be out of place here to examine the explanation which this author has given with regard to the consolidation of those deposited strata which is by means of the filtration of water, but as in this place there occurs some unusual or curious examples of a particular consolidation of limestone or calcareous deposits, as well as similar consolidations of the siliceous sort, it may be worth while to mention them in their place that so we may see the connection of those things, and give all the means of information which the extremely attentive observations of this naturalist has furnished to the world of letters.
In these acute cases there is probably only a mere apposition, and the blocking up of the sclero-iridian angle is largely mechanical. Here the root of the iris is readily removed in its entirety and a really peripheral iridectomy is easily done. When, however, a true adhesion between corneal and iridic tissue takes place the filtration angle is not so easily opened.
In such cases it is often feasible, by excavating a filtering sump or pump-well at a little distance from the side of the stream, and at a sufficient depth below the level of its bed to secure a supply tolerably purified by filtration through the intervening earth. The distance at which this sump should be placed from the bed of the stream will depend on the character of the soil.
They may be briefly classified as: 1. Those that cause a partial or complete closure of the lymph spaces and Schlemm's canal by cicatrical contraction, as in sclero-keratitis. Those that cause obstruction to the lymph spaces at the filtration angle by the deposition of fibrin or cellular elements, as in iritis, hemorrhage into the anterior chamber, etc.
After the soil in the neighborhood of the dwellings has been drained and cultivated with care, and in a more systematic manner than at present, the bottoms of the cellars should be purified as well as the foundations of the walls and of the houses. The water intended for drinking, which contains the Limnophysalis hyalina, should be freed from the fungus by a vigorous filtration.
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