This book originated in a series of articles prepared forT he Independent in 117-18 for the purpose of interesting the general reader in the recent achievements of industrial chemistry and providing supplementary reading for students of chemistry in colleges and high schools. I am indebted to Hamilton Holt, editor ofT he I ndependent, and to Karl V. S. Howland, its publisher, for stimulus and opportunity to undertake the writing of these pages and for the privilege of reprinting them in this form. In gathering the material for this volume I have received the kindly aid of so many companies and individuals that it is impossible to thank them aU but I must at least mention as those to whom I am especially grateful for information, advice and criticism: Thomas H. Norton of theD epartment of Commerce; Dr. Bemhard C. Hesse; H. S. Bailey of theD epartment of A griculture; Professor Julius Stieglitz of the University of Chicago; L. B. Edgar of theD uP ont deN emours Company; Milton Whitney of the U. S. Bureau of Soils; Dr. H. N. McC oy; K. F. KeU erman of theB ureau of Plant I ndustry. E. E. S.
(Typographical errors above are due to OCR software and don't occur in the book.)
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