The Asa Gray Bulletin; Devoted to Plant Life in Field, Forest and Garden Volume 1-2

The Asa Gray Bulletin; Devoted to Plant Life in Field, Forest and Garden Volume 1-2

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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. 1893 edition. Excerpt: ...of water or at least where they will be kept moist. A few such as Spirogyra, Mesocarpus, can be pressed out in the hand and the green wad thrown into the basketor can to be soaked up later. As far as possible algae should be collected in fruit. In most cases this is necessary for their specific identification. A very convenicnt way is to carry two glass slides and a tolerably good pocket lens. Place the algae between the glass slides and examine closely with the lens. In the larger algaa the fruit is usually large enough to be seen in this way. Some forms, as Cladophora, never produce fruit and these can be collected at any time. In many of those too small to be seen with the hand-lens the fruit, if present, is not so important in classification. If the algae are to be studied fresh they should be put into dishes of, water and the conditions made as near ly natural as posible; that is, if an alga is found in running water, provide running water for it. When this, as is usually the case, is not possible the material will often keen for a long time by covering the top of the jar or dish with a glass plate. This prevents Those growing on damp ground and on grass and moss, damp stones or wood will keep very well on wet blotting paper covered with a glass dish; bell jars are the handiest but where they are not accessible any glass dish that will keep the atmosphere under it moist, will answer. Some algae make beautiful herbarium specimens if properly prepared. They can be mounted on either paper or mica; the latter, in thin sheets, being the best for the smaller forms. They can then be wet when wanted and examined without removing them 'from the mica. In mounting the larger forms the great-_ est difiiculty is to get them to lie spread...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236740378
  • 9781236740373