Scientific Proceedings Volume 10

Scientific Proceedings Volume 10

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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. 1905 edition. Excerpt: ...the surrounding atmosphere in a receiver. At the end of twenty-four hours the phenolphthnlein had become pink. The receiver was then opened, and the indicator decolorized by contact with the air. When it had become colourless, it was again shut up. On the following dab it had become pink a second time. The receiver was again opened, and the Pllenolphthalein decolorised. Before closing for the third time, the radium was removed. The pink coloration new failed to re-appear. Although the experiment seemed at the time quite conclusive, on repeating it subsequently with variations, it has been found that a neutral solution of phenolphthalein, either in pure water or in agar, though not exposed to radium, becomes pink when Supported over a solution of caustic potash in a closed chamber. The indicator in this case, too, may be decolorised and coloured again three or four times; but it finally 159" its Power of regaining colour, although under the same conditions which previously Wlfled it to become pink. This unexpected behaviour of the indicator renders the detection of the electrons by its means very uncertain. PLATE XVI. FIG. 1. Plate culture of Bacillus pyocyaneus, exposed in the cold for f0111' days to the tube containing 5 mgrs. Of radium bromide, distrzllt 10 mm., and incubated in presence of the radium f0! three 1 days at 22 C. 2. Plate culture of B. pyocyaneus, exposed four days in cold t0 the same sample of ra.diui: n, distant 7 mm., and incubated lW days at 22 0. The dark horizontal line, just below 51 clear central patch, is the expression of the denser 1'Wth of the colonies in the shadow of a. platinum rod which inter vened between the culture and the radium. EXPLANATION OF PLATE XVII. PLATE XVII. FIG. 1. Photograph...
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Product details

  • Paperback | 96 pages
  • 189 x 246 x 5mm | 186g
  • United States
  • English
  • black & white illustrations
  • 1236827147
  • 9781236827142