Excerpt from Revised Text-Book of Geology
The late Professor Dana had begun a revision of this work a short time before his death. The request of his family that I should complete the work of my revered teacher, was responded to with something like a feeling of filial obligation.
It was proposed in the plan of revision that the distinctive characteristics of the book should be preserved so far as possible. It was to be brought down to the present time as regards its facts, but it was still to express the well-known opinions of its author. The general plan of arrangement was to be kept unchanged, and the size of the book to be increased as little as possible.
In the progress of the work it became manifest that the usefulness of the book would be increased by certain changes more radical than had been at first contemplated. The zoological and botanical classifications used in the former edition were judged to be obsolete. The endeavor has been made to substitute for them, as nearly as practicable, the classifications which are followed in the majority of recent manuals on zoology and botany, whether precisely accordant with my own views or not.
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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. Это и многое другое вы найдете в книге Revised Text-Book of Geology (Classic Reprint) (James Dwight Dana)