The fragments of coral which are occasionally cast on the "flat" are during gales of unusual violence swept together on the beach, where the waves each day at high-water tend to remove and gradually wear them down; but the lower fragments having become firmly cemented together by the percolation of calcareous matter, resist the daily tides longer, and hence project as a ledge.
"Coral-Reefs"
Darwin, Charles
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.
"The Law-Breakers"
Ridgwell Cullum
From all this will be seen how strong is the theory of aqueous percolation, for, given time and pressure, water charged with earth-crust constituents appears to be the origin of the formation of all precious stones; and all the precious stones known have, when analysed, been found to be almost exclusively composed of upper-earth-crust constituents; the other compounds which certain stones contain may, in all cases, be traced to their matrix, or to their geological or mineralogical situation.
"The Chemistry, Properties and Tests of Precious Stones"
John Mastin