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absorbed acetic acre action agriculture ammonia animal and vegetable appears ascend atmosphere bark bulk burned carbonic acid cent chemical changes chemistry chemists circulation of plants colour combination compounds consist constitution contain crop decay decomposed decomposition derived diastase dissolved elementary bodies elements enter exists experiments functions gluten grain grape sugar grass grow growth gypsum heat Hence hereafter hydrogen increase inorganic interior juices land leaf leaves lecture less lime liquid manure nature nitrate of soda nitric acid nitrogen observed organic matter organic substances oxalic acid oxygen portion potash potatoe present produced properties proportion quantity rain readily roots of plants salt saltpetre seed silica soil solid substances soluble solution stances starch stem sulphate of soda sulphuric acid supply supposed tain tartaric acid temperature tion trees ture vegetable matter vegetable substances vessels watery vapour weight wheat wood woody fibre yield
Halaman 96 - 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.
Halaman 49 - ... 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.
Halaman 12 - Proceedings of the Geological and Polytechnic Society of the West Riding of Yorkshire.
Halaman 80 - 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.