Excerpt from The Journal of Agricultural Science, 1915-16, Vol. 7
Boussingault and Lewy had indeed shown that the percentage of oxygen in the soil air was almost the same as that in the atmosphere, but their results were overlooked. As a matter of fact they rather contributed... to the growth of the idea, for in their paper they laid chief stress on the fact that soil air contained 22 times as much carbon dioxide as ordinary air, and did not emphasise its close similarity in oxygen content.
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