Recent Investigations and Ideas on the Fixation of Nitrogen by Plants

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THREE totally different, though convergent, scientific controversies have arisen during the latter half of the present century concerning the rĉle played in nature by nitrogen, as met with in the air, rain, and soil, free or combined, in connection with the ordinary plants of agriculture and forestry; and, quite apart from their real relations to one another, these three controversies have at times been somewhat confused in their issues.

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