Excerpt from Rocks and Soils: Their Origin, Composition and Characteristics; Chemical, Geological and Agricultural
Five years ago I was requested to prepare a course of instruction in chemical geology for students in one of the American agricultural colleges. Since then it has been my privilege to deliver a series of lectures on the subject to six consecutive classes, first at the Massachusetts Agricultural College, and later here in the Imperial College of Agriculture. When I entered into an engagement with the Japanese Government, the continuation of such instruction was stipulated as a part of my duty.
These facts account for the compilation of the material here gathered. The reasons for now presenting the results to a larger audience are chiefly these: As the work has progressed, my students have repeatedly requested the preservation of the lectures in a more permanent and accessible form; while the magnitude of the field from which I have garnered, and the extremely scattered condition of the literature to which access was found necessary, have convinced me of the desirability of attempting to bring the materials together in a more readily accessible form, - an attempt not previously made, I believe. Hence the book must present some features peculiar to itself, and may, therefore, reasonably seek a favorable, or at least considerate, reception by those in whose interests it has been prepared.
The nature of the work is such that I have no claim for the presentation of new material; I have neither theories nor opinions of my own to force upon the public. Such personal views as are offered are only expressed where such a course was deemed essential to a clear presentation of the facts recorded.
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