| Author: |
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Anna Sewell
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| Title: |
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Black Beauty, Young Folks' Edition |
| Moochable copies: |
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No copies available |
| Amazon suggests: |
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| Topics: |
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| Published in: |
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English |
| Binding: |
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Paperback |
| Pages: |
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108 |
| Date: |
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2012-05-14 |
| ISBN: |
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1443210277 |
| Publisher: |
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RareBooksClub.com |
| Weight: |
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0.46 pounds |
| Size: |
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7.32 x 0.24 x 9.53 inches |
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| Description: |
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Product Description
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. 1906 Excerpt: ... of the gelatin used. Those differences which are really characteristic of the organisms themselves appear to be related to two fundamental powers: the general vigor of growth and the liquefying power. It may be possible that other differences exist in old gelatin colonies which are really characteristic, but in the present state of knowledge it seemed best to omit the gelatin plate in favor of more definite tests. Liquefying power and general vigor of growth are observed in the gelatin stab and the agar streak respectively. Gelatin tubes.--All our cultures have been studied in the gelatin tube, but only the single character of the amount of liquefaction has been systematically recorded. The distinction between different non-liquefying colonies lies in the amount of surface growth and the color, both of which characters are more easily studied on the agar streak. The character of the surface growth, like that of the gelatin plate colony, does not appear in this group to offer any character of diagnostic value, and all the cocci grow fairly well in the stab. Among the liquefying forms we have not found the shape of the liquefaction of sufficient constancy to be recorded. Whipple (1902) has strikingly shown the uncertainty of this character--almost every possible type appearing in media made with slightly different commercial gelatins. The Committee on Standard Methods (1905) has also omitted this property. The amount of liquefaction of gelatin was therefore the only character recorded on the gelatin stab. The method by which this was measured will be described under "Biochemical Reactions." Agar plates.--The same reasons which led us to omit the gelatin plate militate against the use of the agar plate as a diagnostic test. Constant differences whic...
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| URL: |
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http://bookmooch.com/1443210277 |
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