<i>Soils. Their Formation, Properties, Composition and Relation to Climate and Plant Growth, in the Humid and Arid Regions</i> . By E. W. Hilgard, Ph.D., LL.D., Professor of Agriculture in the University of California and director of the California Agricultural Experiment Station. The Macmillan Company. 1906. 8vo. Pp. xxvii +593; 89 figures, including 37 photographic illustrations. $4.00 net.
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