Book Description

Excerpt from The Journal of Geology, Vol. 8: July August, 1900 It appears then that in general the diagram of a rock-series will consist of curved lines to indicate the variations in percent age amount of the several bases'. Of these curves we may dis distinguish two kinds: (a) When the constituent in question first increases to a maximum and then decreases, or increases first more rapidly and then less rapidly, or decreases first less rapidly and then more rapidly, the curve will be Eonvex upward; (e) When it decreases to a minimum and then increases, or decreases first more rapidly and then less rapidly, or increases first less rapidly and then more rapidly, the curve will be concave upward. This. Classification is not an exhaustive one, for there may be curves which are in ected, being convex in one part and concave in another, but it will be sufficient to consider the simpler cases. Since the sum of the ordinates for all the bases falls off steadily in linear fashion, its curve of variation 'being the straight line yx, it follows that in any series, other than an ideal linear one, some of the bases must give convex and others concave curves. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."