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Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 1, No. 3

Contributions from the Botanical Laboratory of the University of Pennsylvania Volume 1, No. 3


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1897 Excerpt: ...of the seed-coats of the aerial ones is an obstacle to their more general germination. In nature, few, if any of these are likely to produce plants in the succeeding spring. The seeds of type (b), while in general appearance and histological structure not distinguishable from type (a), do not seem to possess the same capacity for responding to conditions suitable for germination if both sets are planted without filing. It may be that (b) requires a longer resting period than (a). An interesting feature has been noticed in the behavior of the cotyledons, of both terrestrial and aerial seeds, but particularly the former. Normally these, as has been stated, remain below the surface; if however, the seeds happen to be in such position that the cotyledons are wholly or partly exposed to the light, chlorophyll is developed with astonishing rapidity. Nor does it seem that much light is required; seeds which were germinated between layers of flannel, in a deep box placed under the shelves near the floor of the greenhouse showed this phenomenon well within three weeks. Aerial and terrestrial seeds behaved similarly in this respect. During the winter a plant raised from a terrestrial seed, whose cotyledons remained half above the soil, attained the height of two and a half feet, and produced numerous legumes. The size of the cotyledons was but little reduced; they were firm and not at all shriveled in appearance. The exposed portion of the cotyledons was an intense dark green, really deeper than that seen in the leaves; the subterranean half was quite white; a sharp demarcation showed plainly how the seed had been placed. Sections through the very green portion showed chlorophyll granules, closely crowded around the cell walls; in the deeper tissue of each cotyledon, ..


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Product Details
  • ISBN-13: 9781153465243
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 52
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1153465248
  • Publisher Date: 01 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 109 gr


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