Contamination of the soil, ground water, and air by percolation of sewage.
Percolation is a slow process in the hard head of the worldly-wise.
From the dried root of bistort or snake-weed (Polygonum Bistorta), by percolation with temperate distilled water.
If the percolation and evaporation have been properly performed the fluid extract will not be required to be filtered.
No other means of agitation or percolation is so efficacious or economical.'
The river contained more water the higher we mounted, for below the water was lost by evaporation and percolation into the ground.
Of course, with such a pressure as this, there was likely to be percolation under the foundations and a washing-out of the soil.
The method of percolation is now preferred by all who have made sufficient trial of it to apply it correctly.
This wadi, which is some 63 m. long, obtains water by percolation from the Nile.
Ethereal tinctures are best prepared by percolation, and should be both made and kept in stoppered bottles.