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Updated: May 21, 2025
I endeavoured to prove this point by a series of experiments, of which the following is a brief abstract: Having prepared a cold infusion of galls, I allowed a portion of it to remain exposed to the atmosphere, in a shallow capsule, until it was covered with a thick stratum of mould; the mould was removed by filtration, and the proper proportion of sulphate of iron being added to the clear fluid, a compound was formed of a deep black colour, which showed no farther tendency to mould, and which remained for a long time without experiencing any alteration.
Experiments, however, for example, by E. E. Henderson, have shown that the rate of filtration in an eye with artificially raised pressure is considerably larger when it is under the influence of eserin than it is when under the influence of atropin; that is by the contraction of the pupil the iris-surface filtration is increased and consequently the pressure is reduced.
Erosion has been the architect of the Cite du Diable, partly by impetuous floods, partly by slow filtration. Water has gradually, and in the slow process of ages, built up the whole, then vanished altogether. Nothing strikes the imagination more than the absolute aridity of the region now.
No doubt seems now to be entertained, that our rivers and lakes have undergone immense diminutions; but many geological facts remind us also, that these great changes in the distribution of the waters have preceded all historical times; and that for many thousand years most lakes have attained a permanent equilibrium between the produce of the water flowing in, and that of evaporation and filtration.
When possible, substances are selected which separate in crystalline form, since such substances are less likely to clog the pores of filter paper and can be most quickly washed. In order to increase the size of the crystals, which further promotes filtration and washing, it is often desirable to allow a precipitate to remain for some time in contact with the solution from which it has separated.
This examination having been made, the contents of the alimentary canal, and any other substances to be examined, must be submitted to chemical processes. Simple filtration will sometimes suffice to separate the required substance; in other cases dialysis will be necessary, in order that crystalloid substances may be separated from colloid bodies.
This was followed by the proper filtration and racking both of Ports and Madeiras, and whether milk or egg were best for the purpose Kennedy recounting his experience of different vintages both here and abroad, the others joining in, and all with the same intense interest that a group of scientists or collectors would have evinced in discussing some new discovery in chemistry or physics, or the coming to light of some rare volume long since out of print everybody, indeed, taking a hand in the discussion except Latrobe, whose mouth was occupied in the slow sipping of his favorite Madeira tilting a few drops now and then on the end of his tongue, his eyes devoutly closed that he might the better relish its flavor and aroma.
Hence some other factor must join itself to the physico-mechanical process of filtration and affect or destroy it, and this factor can be found only in the protoplasm, the vital element of the cells; for we know that the sublimate acts with pernicious effect on it and in such a manner that it destroys its entire power of reaction; it kills it, as we say.
The calcium precipitate usually carries down with it some magnesium, and this can best be removed by redissolving the precipitate after filtration, and reprecipitation in the presence of only the small amount of magnesium which was included in the first precipitate. The reaction is
Over great areas homogeneous traditions held, and it needed wars and conquests, or it needed missionaries and persecutors and conflicts, or it needed many generations of intercourse and filtration before a new tradition could replace or graft itself upon the old.
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