The Asa Gray Bulletin; Devoted to Plant Life in Field, Forest and Garden Volume 4-5

The Asa Gray Bulletin; Devoted to Plant Life in Field, Forest and Garden Volume 4-5

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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. 1896 edition. Excerpt: ...a flower and This illustration is reproduced from Meehcm's Monthly for November, through the courtesy of the Editors. ' made its escape, but sucl1 escapes are evidently exceedingly rare. Death usually overtakes the captive. In the home of this plant there must, evidently, be some insect which can safely extract the pollen masses so' as to fertilize the ovaries! Here there seems to be no insect able to do vthis, though this unfortunate Plusia tries to do so, and forfeits its life in the attempt, a sacrilice to one of nature's misfits., brought about by the introduction of the Physian'thus into the territory of this moth. lA Pteris was also caughtin the same manner, as were a couple of pale gray moths, not identified., I As might be expected the pla11t fails to produce seed here unless pollinated by hand. I fertilized a few of the flowers and obtained three large follicles about the size of a base ball. They were not quite matured 'however when the vines had to be removed to the greenhouse on the approach of frost. In the removal the fruits were detached and so did not have an opportunity to ripen. The follicles are' full of comose seeds just as in the common milk-weed. ' The close interdependence of plant and insect life is clearly illustrated by in-' stances like this of the Physianthus. in agiven region may be dependent on the presence of their necessary insect We see that the presence of certain plants allies quite as much, as on any peculiarity of soil or temperature: We also see that a race of insects may be extirpatedyby the importation into their habitat of some plant inimieal to their existence. Mechanical Elevation of the Iloots of Trees. Tnnononn G. WHITE. (WITH PLATE I.). more

Product details

  • Paperback | 82 pages
  • 189 x 246 x 4mm | 163g
  • United States
  • English
  • black & white illustrations
  • 1236798643
  • 9781236798640