"Perviousness" Quotes from Famous Books
 ... rock may depend on its perviousness to water which may enter along planes of bedding or incipient fracture planes, or along the minute pore spaces between the mineral particles. The water may cause disastrous chemical changes in the minerals and by its freezing and thawing may ...
— The Economic Aspect of Geology • C. K. Leith
... consists of invisible calorific rays, regarding which colour teaches us nothing. A body may be highly transparent to the one class of rays, and highly opaque to the other. Thus the white powder, which has shown itself so powerful an absorber, has been specially selected on account of its extreme perviousness to the visible rays, and its extreme imperviousness to the invisible ones; while the dark powder was chosen on account of its extreme transparency to the invisible, and its extreme opacity to the visible, rays. In the case of ...
— Fragments of science, V. 1-2 • John Tyndall
... farther. For aught he knew there were oat-cakes and milk and sheep and collie dogs ever higher and higher still. Not until he actually stood upon the peak did he know that there was the earthly hitherto—the final obstacle of unobstancy, the everywhere which, from excess of perviousness, was to human foot impervious. The sun was about two hours towards the west, when Gibbie, his little legs almost as active as ever, surmounted the final slope. Running up like a child that would scale heaven he stood on the bare round, ...
— Sir Gibbie • George MacDonald |
