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The Story of the Soil; from the Basis of Absolute Science and Real Life, Chapter 16 MORE PROBLEMS 
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The Story of the Soil; from the Basis of Absolute Science and Real Life, Chapter 16 MORE PROBLEMS Chapter 16 MORE PROBLEMS
"NOW let us give Mr. Johnston a chance to tell us about the nitrogen problem," said Mr. Thornton. "I'm pretty well satisfied with the natural circulation of carbon, oxygen, and hydrogen; but I want to understand all I can of the practical methods of securing and utilizing nitrogen; and we have heard almost nothing about the other six essential elem
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