Sometimes these cavities may have been filled at the time the rock was being erupted, but in most cases the mineral matter would appear to have been introduced subsequently by the action of water percolating through the rock.
"Geology"
James Geikie
subsequently, I learned, also, that strong winds often disturb the Polar atmospheric sameness; but all is given here because of the striking impression which it made upon me at this time.
"My Attainment of the Pole"
Frederick A. Cook
Whether the Dutch "Vorbildung" of the Art of Printing subsequently invented at Mainz took the form of experiments with shankless types, or fell short of the fully developed art in some other way, does not greatly concern the collector.
"Fine Books"
Alfred W. Pollard