As a general rule the sands in the immediate vicinity of the shore contain organic matter resulting from land drainage (particularly near great centres of human population) and from the remains of dead plant and animal organisms. At the same time the denudation of rocks sets free iron compounds which dissolve in the sea to a slight extent and permeate the littoral sands which contain organic matter.
They permeate his controversial and political writings and historical studies, of which his Handbook of Dutch History (in Dutch) and Maurice et Barnevelt (in French, 1875, a criticism of Motley's Life of Van Olden-Barnevelt) are the principal.
It might suffice to single out the influence of Auguste Comte, as the last great thinker who wrote before Darwinism began to permeate philosophic speculation.
The strong, vigorous, healthfulness and enjoyment which permeate the record of his Alpine work are magnificent, and traces of his influence remain in Switzerland to this day.
Among such contributory causes is the more familiar intercourse of settled nations which we enjoy in our own day; the ideas of one nation rapidly permeate neighbouring nations, and by the means of printed books penetrate into remoter provinces and into distant lands.
Travers has suggested that it may explain the liberation of helium from minerals by heat, the gas being enabled to permeate the siliceous materials in which it is enclosed.
However much compressed by mechanical means it is still a porous mass, and when it is confined as in a gun the flame and hot gases from the portion first ignited permeate the remainder, generally causing it actually to detonate, or to burn so rapidly that its action approaches detonation.