A text-book of bacteriology : including the etiology and prevention of infective diseases and a short account of yeasts and moulds, haematozoa, and psorosperms / by Edgar M. Crookshank.

  • Edgar Crookshank
Date:
1896
Catalogue details

Licence: Public Domain Mark

Credit: A text-book of bacteriology : including the etiology and prevention of infective diseases and a short account of yeasts and moulds, haematozoa, and psorosperms / by Edgar M. Crookshank. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    Fig. 3.— On the surface of Nutrient Agar-agar. Pure-cultivation of Bacillus indicus on the surface of obliquely solidified nutrient agar-agar. The growth has the colour, of red sealing-wax, and a peculiar crinkled appearance. After some days it loses its bright colour and becomes purplish, like an old cultivation of Micrococcus prodigiosus. Fig. 4.—On the surface of Nutrient Agar-agar. A pure-cultivation obtained from an abscess (Staphylococcus pyogenes aureus). Fig. 5.—On the surface of Nutrient Agar-agar. A pure-cultivation obtained from green pus (Bacillus pyocyaneus). The growth forms a whitish, transparent layer, composed of slender bacilli, and the green pigment is diffused throughout the nutrient jelly. The growth appears green by transmitted light, owing to the colour of the jelly behind it. Fig. 6.— On the surface of Potato. A pure-cultivation of the bacillus of glanders on the surface of sterilised potato. DESCRIPTION OF PLATE III. Plate-cultivation. Following p. 108. This represents the appearance of a plate-cultivation of the comma-bacillus of Cholera nostras, when it is examined over a slab of blackened plate-glass. The drawing was made from a typical result of thinning out the colonies by the process of plate-cultivation. At this stage they were completely isolated one from the other; but later they became confluent, and produced complete liquefaction of the gelatine. DESCRIPTION OF PLATE IV. Streptococcus Pyogenes. Following p. 178. Fig. 1.—From a cover-glass preparation of pus from a pyaemic abscess. Stained with gentian-violet by the method of Gram, and contrast-stained with eosin. x 1200. Powell and Lealand’s apochromatic Horn. imm. E. P. 10. Fig. 2.—From cover-glass preparations of artificial cultivations of the strepto- coccus in broth and in milk at different stages of growth, x 1200. Powell and Lealand’s apochromatic Horn. imm. E. P. 10. In these preparations there is a great diversity in size and form of the chains and their component elements. In the drawing examples are figured of the following: (a) Branched chains. (#) Simple chains composed of elements much smaller than the average size. (e) Chains with spherical and spindle-shaped elements at irregular intervals. These are conspicuous by their size, and are sometimes terminal. (d e) Chains in which the elements are more or less uniform in size. (/) Complex chains with elements dividing both longitudinally and transversely, and varying considerably in size in different lengths of the same chain.