Excerpt from Soils: Their Properties and Management
The authors wish to acknowledge the originals of the two colored maps as occurring in Bulletins 60 and 96 of the Bureau of Soils, U. S. Department of Agriculture. The remaining illustrations were drawn especially for this text. Some few are copies in part, or in whole, from other authors. Acknowledgments not made in text are due the Bureau of Soils, U. S. Department of Agriculture; T. C. Chamberlin; E. W. Hilgard; F. H. King; G. P. Merrill: and H. W. Wiley. The authors wish also to express their appreciation to Messrs. A. B. Beaumont and J. H. Bromley for their careful work in the preparation of the original drawings and to Miss Lela G. Gross for aid on the manuscript. Thanks are also due Professor W. D. Bancroft for suggestions as to the theoretical phases of soil colloids and to Professor J. L. Stone for a like favor regarding the soundness of the chapter on fertilizer practice.
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