Botanical Gazette Volume 27

Botanical Gazette Volume 27

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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. 1899 edition. Excerpt: ...not yield to pressure from within. Such a joint will be pressure tight. A little water is poured into the tube with a pipette and brought to some zero mark. The stop-cock is then closed. As the water rises in the tube it will compress the air column, and the approximateamount of pressure exerted may be measured by Mariotte's law, i. e., under constant conditions the. pressure is inversely proportional to the volume of the air. Of course the successive readings should be taken as nearly as possible at the same temperature. The water.vapor in the tube is a source of error, but not an appreciable one if the readings are taken at constant temperatures. All manometer gages used for such purposes as this are liable to an error not always recognized, in that they assume the quantity of water available for exerting pressure to be unlimited, whereas in fact it is always limited. If the plant be small and the gage be large, the plant may not give off quantity enough to push the registering fluid up to the point which it should reach in order to register the true pressure under which the water actually is given off. Hence these gages are likely to register pressure more accurately the smaller they are. Sm1th College, Northampton, Mass.-Root pressure gage. OOGENESIS IN PINUS LARICIO. WITH REMARKS ON FERTILIZATION AND EMBRYOLOGY. CONTRIBUTIONS FROM THE HULL BOTANICAL LABORATORY. XIV. Charles J. Chamberla1n. (WITH PLATES IV-VI) In the autumn of 1896, while conducting laboratory work in the special morphology of the gymnosperms, I noticed puzzling peculiarities in the development of the nucleus of the oosphere, but the material lacked important stages and had not been properly fixed for cytological study. The next spring, however, at intervals of three...
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Product details

  • Paperback | 180 pages
  • 189 x 246 x 10mm | 331g
  • United States
  • English
  • black & white illustrations
  • 1236829697
  • 9781236829696