American geology is so rapid important new discoveries follow one another in so quick succession that any text-book, however carefully prepared, must require large revision in a very few years. In the present edition the alterations, by omission, by modification, and especially by additions, are so numerous and so great that it was found necessary to reset the whole work, and to rewrite a large portion. I have tried to do this without enlarging to any considerable extent the size of the book The most important changes are the following: In Part I I have made some additions to the discussion of river-agencies, especially in regard to the mutual relations of erosion and sedimentation; and to rivers as indicators of crust-movements. On the subject of earthquakes I have left out the general discussion of waves, as belonging strictly to physics, and have given more fully the subject of seismometry. On coral reefs I have given a brief account of the theory of Murray on the formation of atolls and barriers. I have stricken out entirely the section on Geographical Distribution ofO rganisms, as belonging either to Biology or toP hysical Geography, and to make room for more strictly geological matters pressing for recognition. But I have made compensation for this by a much fuller discussion, in Part III, of the geological causes of present distribution. In Part II the structure and position of stratified rocks are largely rewritten, and some changes introduced. The discussion on mineral veins has been somewhat enlarged, and many changes introduced in the discussion of faults and their causes. The section on mountains hag been entirely rewritten, the order of presentation changed, and new matter introduced.
(Typographical errors above are due to OCR software and don't occur in the book.)

About the Publisher

Forgotten Books is a publisher of historical writings, such as: Philosophy, Classics, Science, Religion,