Transactions - Botanical Society of Edinburgh Volume 16

Transactions - Botanical Society of Edinburgh Volume 16

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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. 1886 edition. Excerpt: ...of temperature accumulated. In this manner the part played by the water as such was determined, and in any case, where even a very small accumulation of gases took place the experiment was repeated. When a hardly appreciable quantity of gas had accumulated in the second apparatus, the influence of the changes of temperature on the water was regarded as insufficient to modify the reading in the apparatus in which the experimental plant or plants were exposed, and this reading was accordingly accepted. It need hardly be noted that, in admitting a current of sea-water into the vessels through the india-rubber tubing, great care was taken so to regulate the conditions that bubbles of air were not passed in along with the water, nor were swift surface eddies set up, as these might have caused an abnormal amount of air to pass into the circulating water. After a sufficient amount of gas had accumulated in the collecting tube, the entire apparatus was removed and immersed in a tubful of sea-water which had been prepared for some time so as to settle and acquire a temperature equal to that of the water in the apparatus. The depth of water in the tub was such that the lower end of the collecting tube of the experimental apparatus could be removed from the jar without coming above its surface. The accumulated gas was now decanted into a clean eudiometer which was carefully transferred, its open end being closed by the thumb, to a chemical stand, and on this it was clamped with its lower extremity under the surface of the mercury in the mercurial trough. A reading of the amount of gas present was now taken, the temperature of the room and the height of the harometer at the time being at the same time recorded. Potash and pyrogallic acid were then...
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Product details

  • Paperback | 186 pages
  • 189 x 246 x 10mm | 340g
  • United States
  • English
  • black & white illustrations
  • 1236957652
  • 9781236957658