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Home > History and Archaeology > History > History of the Americas > Half-Hours with the Microscope; Being a Popular Guide to the Use of the Microscope as a Means of Amusement and Instruction
Half-Hours with the Microscope; Being a Popular Guide to the Use of the Microscope as a Means of Amusement and Instruction

Half-Hours with the Microscope; Being a Popular Guide to the Use of the Microscope as a Means of Amusement and Instruction


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1874 Excerpt: ...They are also present in those deposits of clay which once formed the bed of rivers and lakes, and which are now dry. In order to procure the diatoms from these deposits, the clay or earth should be well washed with pure water, and the deposit allowed to subside, and the water poured off. This may be repeated several times. The deposit is then to be washed with hydrochloric acid, and when the effervescence is over, the acid is poured off, and a fresh portion is added. This may be repeated several times, and when the hydrochloric acid ceases to act, nitric acid may be employed in the same manner. When no action occurs by its use cold, the deposit may be transferred to a watch-glass, and kept over a spirit-lamp, at a temperature of about 200, for three or four hours. The deposit must then be well washed with pure water, to remove all the acid. The deposit will be found now to consist almost entirely of diatoms. If anything else be found, it will be grains of sand. By casting the deposit into a small quantity of water, and allowing the heaviest particles alone to subside, these will be generally found to contain the sand and larger diatoms. By repeating this process successively, the deposits consist gradually of smaller and smaller diatoms, which may be examined with gradually higher powers, in proportion to their minuteness. Some are perfectly round, as in the case of the genus Coscinodiscus, a species of which is figured at 38, plate 2. It is marked beautifully over their surface; others are triangular; some are square, and attached together. The last form is seen in Melosira, species of which are figured at 36 and 37, plate 2, and 139, plate 5. The most common forms are those which are oval, or boat-shaped, and represented by species of Pinnularia and Navi...


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Product Details
  • ISBN-13: 9781232931430
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 40
  • Spine Width: 2 mm
  • Width: 189 mm
  • ISBN-10: 1232931438
  • Publisher Date: 14 May 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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Half-Hours with the Microscope; Being a Popular Guide to the Use of the Microscope as a Means of Amusement and Instruction
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Half-Hours with the Microscope; Being a Popular Guide to the Use of the Microscope as a Means of Amusement and Instruction
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