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Excerpt from Address to the Chemical Section of the British Association With regard to the nitrogen of vegetation, both from the known characters of free nitrogen, and as he considered a legitimate deduction from direct experiments, he argued that plants did not take up free or uncombined nitrogen, either from the atmosphere, or dissolved in water and so absorbed by the roots. The source of the nitrogen of vegetation was, he maintained, ammonia; the product of the putrefaction of one generation of lants and animals affording a supply for its successors. He pointed out that, in t 9 case of a farm receiving nothing from external sources, and selling off certain products, the amount of nitrogen in the manure derived by the con sum tion of some of the vegetable produce on the farm itself, together with that due to e refuse of the cro s, must always be less than was contained in the crops grown; and he conclu cd that though the quantity so returned to the land was important, a main source of the nitrogen assimilated over a given area was that brou ht down from the atmosphere in rain. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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