Report [With Annual Summary] for Volume 7-10

Report [With Annual Summary] for Volume 7-10

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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. 1902 edition. Excerpt: ...margin is more than the best climbers among them can get over, and if they attempt it they invariably fall to the ground. There is no necessity for the lamina of the leaf to be very broad; even narrow leaves, as, for instance, those of Gentiana. firma, are enough for the purpose, supposing, of course, that the margin is bent backwards in the way described." Of this mode of protection the cyclamen and snowdrop offer familiar examples. In vain do ants attempt to obtain access to such flowers: the curved surfaces bafile them; when they come to the edge they inevitably drop off to the ground again. In fact, these pendulous flowers protect the honey as effectually from the access of ants as the hanging nests of the weaver and other birds protect their eggs and young from the attacks of reptiles.--Avebury Ants, Bees, and Wasps, ch. 3, p. 52. Bacteria of Nit1-1: ficution.' Nitrification occurs in two stages, each stage performed by a distinct organism. By one (nitrosomonas), ammonia is converted into nitrite; by the other (nitrobacter), the nitrite is converted into nitrate in which latter form alone the plant can use it. Both organisms are widely and abundantly distributed in the superficial soils. They act together and in conjunction and for one common purpose. They are separable by employing favorable media. "' " They belong to the soil, river water, and sewage. They are also said to be frequently present in well water. From some experiments at Rothamsted it appears that the organisms occur mostly in the first twelve inches, and in subsoils of clay down to three or four feet. In sandy soils nitrification may probably occur at a greater depth.--Newman Bacteria, ch. 5, p. 158. Love of the Beautiful--E: lhet'ic Sense more

Product details

  • Paperback | 88 pages
  • 189 x 246 x 5mm | 172g
  • United States
  • English
  • black & white illustrations
  • 1236849558
  • 9781236849557