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Updated: June 19, 2025
The fact that the water was highest in the most distant well appears to show that it was derived from the inundation and not, by lateral infiltration, from the river. But water is found beneath the sands at points far above and beyond the reach of the inundations, and can be accounted for only by subterranean percolation from the Nile.
It was surprising to see what a clearance he made in an hour. The existence of the fault helped him a good deal, as the percolation of water at this point had oxidized the stone to rottenness. To his great joy he discovered that a few prods with the pick laid bare a small cavity which could be easily enlarged.
I then argued that the British Government would certainly not have done so, seeing that, to have so acted would have diminished the means available for contending with famine, for, as I fully urged, it is perfectly well known that the further the water travels the greater is the waste from percolation and evaporation, and the smaller the amount of land it can irrigate.
The usual absence or rarity of organic remains in beds of loose gravel and sand is partly owing to the friction which originally ground down the rocks into small fragments, and partly to the porous nature of alluvium, which allows the free percolation through it of rain-water, and promotes the decomposition and removal of fossil remains.
In front of where he stood, within a few paces of his feet indeed, for a distance of quite twenty yards the lower part of the bank had slipped away, washed from the stone core with which it was faced at this point, by a slow and neglected percolation of water.
The ground round the base of Mount Gambier is very open, and you may ride your horse along it unchecked for many miles. At the lower parts, and at some distance from it, the ground is moist, and many caverns have been found in which water of the very purest kind exists, no doubt deposited in the natural reservoirs by percolation from the higher ground.
But, even suppose that such a general operation were found to take place in the earth above the level of the sea, where there might be a circulation of air and percolation of water, How could the strata of the earth below the level of the sea be petrified?
As they occasionally become full in seasons when no rain falls, and resemble somewhat in this respect the rivers we have already mentioned, it is probable they receive some water by percolation from the river system in the country beyond.
Including the above there are twenty or twenty-four perennial brooks and torrents which give a good supply of water in the dry season; in the wet season they are supplemented by a number of burns, which, though flowing now, have their mouths blocked up with bars of sand, and yield nothing except by percolation; the Lake rises at least four feet perpendicularly in the wet season, and has enough during the year from these perennial brooks to supply the Shiré's continual flow.
"Huh!" retorted Mammy, "I on'y wisht I could feel dat dey was frien'ly ones, but I has a percolation dat dey's comin' from below stidder above." So perhaps this explains why she went up to Peggy's room at an hour which she usually spent in her own quarters mending.
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