Appletons' Annual Cyclopedia and Register of Important Events of the Year Volume 18

Appletons' Annual Cyclopedia and Register of Important Events of the Year Volume 18

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1884 edition. Excerpt: ...his experiment on the 12th of June, giving the plants on one side of each plate a regular and frequent supply of animal food in the form of pieces of roast beef of about one fiftieth of a grain, while those on the other side of the partition were left entirely to the ordinary sustenance of plants. After the second day's feeding the experiment was interrupted, and first resumed on the 5th of July. By the 15th of July the fed plants were noticed to be much fresher and greener than the others, and a microscopical examination revealed a much larger quantity of chlorophyl than the starved plants, and that the grains of chlorophyl were loaded with starch; the nitrogeneous diet therefore promoted the assimilation of plant-food and the storing of reserve material. By_ the 5th of August there were found on count to be 49 per cent. more plants in the division fed with beef than in the other, although the unfcd plants were slightly in excess and more vigorous at the beginning of the ex eriment. By the end of August the plants ad blossomed and the seeds were ripe. The seed capsules were cut off and the seeds counted, and the plants in the two division were compared as to number, size, weight, number of capsules and their weight, and number of seeds and their weight. In one respect only, that of height, the com arison was in favor of the unfed plants, an here only in the proportion of 100 to 99-9. In every other particular they were excelled by the plants which had been supplied with animal food. The portions of the plant connected with the functions of reproduction showed the advantage of nitrogenous food in the most marked degree; while the proportion between the average weights of the starved and the fed plants was as 100 to 1413; more

Product details

  • Paperback
  • 189 x 246 x 42mm | 1,456g
  • United States
  • English
  • black & white illustrations
  • 1236857380
  • 9781236857385