Lectures on Agricultural Chemistry and Geology, Volume 1

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Wiley and Putnam, 1842 - 295 pagina's
 

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Pagina 94 - have not the slightest reason for believing that the nitrogen of " the atmosphere takes part in the processes of assimilation of " plants and animals ; on the contrary, we know that many plants " emit nitrogen, which is absorbed by their roots, either in a " gaseous form or in solution in water.
Pagina 47 - ... drawn out to a point. (See Fig. 98.) If a dry, cold tumbler be held over a jet of burning hydrogen, its interior will rapidly become covered with a copious deposition of moisture. This results from a condensation of the vapor of water produced by the union of the hydrogen with the oxygen of the atmosphere. 296.
Pagina 10 - Proceedings of the Geological and Polytechnic Society of the West Riding of Yorkshire.
Pagina 78 - Do grasses and trees derive their carbon from the soil? Then, how, by their growth do they increase the quantity of carbonaceous matter which the soil contains? "It is obvious that, taken as a whole, they must draw from the air not only as much as is contained in their own substance, but an excess also, which they impart to the soil.
Pagina 82 - ... maturity. When a plant is quite matured, and when the organs, by which it obtains food from the atmosphere, are formed, the carbonic acid of the soil is no further required.

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