The purpose of this publication is to summarize the recent knowledge regarding the formation and significance of the great soil groups in the United States for the general reader. The treatment is in no sense complete or exhaustive. Attention is directed toward a discussion of those principles in broad implication. Should the reader require more specificity, the detailed reports of surveys and researches must be consulted.

Excerpt from Development and Significance of the Great Soil Groups of the United States Many of these early Studies Of soil from the geological point Of view were fruitful, provided comparisons were confined within small areas in which conditions Of climate, native vegetation, relief, and age were essentially uniform. But without definite knowledge Of the soil characteristics as such, even these results were difficult to inter pret in terms Of native or cultural plants. The confusion, as may be seen from what follows, came about by assuming that a direct relationship exists between the nature Of rocks and Of the soil that develops from their weathered products; whereas many other factors, especially constructional biological forces, more frequently dominate the situation in soil development. 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.

This publication is the fourth in a series designed to aid in the recognition and identification of pathological conditions of economic importance affecting fruits and vegetables in the channels of marketing, to facilitate the market inspection of these food products, and to prevent losses from such conditions.