. The life of the plant. Plant physiology. THE ROOT 95 details were ever before performed in the same way in the presence of so many thousands of spectators. With great pleasure do I recall one sceptic, a local inhabitant of Nijny, who acknowledged that he used to observe our water cultures day after day with the sinister in- tention of convicting us of quackery ; but in the end he became enthusi- astic and thoroughly con- vinced. Our problem is now reduced to this: of all the mass of black mould surrounding the plant, it is only an insignifi- cant pinch of a mixture of certain salts that is a
. The life of the plant. Plant physiology. THE ROOT 95 details were ever before performed in the same way in the presence of so many thousands of spectators. With great pleasure do I recall one sceptic, a local inhabitant of Nijny, who acknowledged that he used to observe our water cultures day after day with the sinister in- tention of convicting us of quackery ; but in the end he became enthusi- astic and thoroughly con- vinced. Our problem is now reduced to this: of all the mass of black mould surrounding the plant, it is only an insignifi- cant pinch of a mixture of certain salts that is at any given moment indispensable for its nu- trition. Now let us find out which of the chemi- cal elements entering into the composition of these salts are essential. It has been necessary for this purpose to make a series of experiments either with white sterile soil into which necessary salts had been introduced, or with culture solutions as described above. Here are experiments showing the necessity of nitrogen for plants (fig. 26). We take two flower-pots filled with a soil calcined and washed with an acid, and consequently white and sterile. To one of them the ash of plants has been added, containing all the mineral. Fig. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Timiri?a?zev, K. A. (Kliment Arkad?evich), 1843-1920; Sheremeteva, Anna, tr. London, New York, Bombay, Calcutta, Longmans, Green, and Co.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplantph, bookyear1912
