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Updated: June 19, 2025
In some cases, these tracts compose basins apparently scarcely at all exposed to any local influence in the way of percolation or infiltration of water towards or from neighboring valleys.
In former times a long spit of this nature seems to have become consolidated by the percolation of calcareous matter, and afterwards to have been gradually upheaved; the outer and loose parts during this process having been worn away by the action of the sea, and the solid nucleus left as we now see it.
If such castings are largely washed away during heavy rains, it is difficult to understand at first how any mould can still remain on our Downs, as there does not appear any evident means for supplying the loss. There is, moreover, another cause of loss, namely, in the percolation of the finer particles of earth into the fissures in the chalk and into the chalk itself.
It seems quite clear, then, that we should manure little and often, as you thereby not only avoid the risk of over-heavy crops, but economize your manure. For is it not obvious that if you put down at once a supply of nitrogen and lime to last for three years, you increase the risk of loss from wash and downward percolation?
The tiny stream of sand suddenly ceased, but resumed its flow the moment its owner jarred the frame, and continued pouring without further interruption. "That is very singular," said Eastford. "How do you account for it?" "I imagine it is caused by some inequality in the grains of sand; probably a few atoms larger than the others come together at the neck, and so stop the percolation.
We may therefore conclude that on this artificially modified hill, as well as in the natural valleys of the neighbouring Chalk Downs, some fine earth, probably derived in large part from worm-castings, is washed down, and accumulates in the lower parts, notwithstanding the percolation of an unknown quantity into the underlying chalk; a supply of fresh earthy matter being afforded by the dissolution of the chalk through atmospheric and other agencies.
The peculiar smell and flavour, it seems, are preserved notwithstanding this percolation, and are considered amply remunerative of the pains and importunity used to obtain it. Such things are strikingly expressive of that worse than brutish perversity which actuates man, when once his lusts have acquired the dominion.
Beds of rock of any thickness, crammed full of organic remains, may yet, either by the percolation of water through them, or by the influence of subterranean heat, lose all trace of these remains, and present the appearance of beds of rock formed under conditions in which living forms were absent.
Such a free percolation may be prevented either by the mineral nature of the matrix itself, or by the superposition of an impermeable stratum; but if unimpeded, the fossil shell or bone will be dissolved and removed, particle after particle, and thus entirely effaced, unless petrifaction or the substitution of some mineral for the organic matter happen to take place.
However, her difficulties were considerable. The percolation of the news of the police failure had reduced the male population to the condition of a joyful desire to celebrate in contraband drink.
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