Practical dairy bacteriology : prepared for the use of students, dairymen, and all interested in the problems of the relation of milk to public health / by H.W. Conn.

  • Herbert William Conn
Date:
1918
Catalogue details

Licence: Public Domain Mark

Credit: Practical dairy bacteriology : prepared for the use of students, dairymen, and all interested in the problems of the relation of milk to public health / by H.W. Conn. Source: Wellcome Collection.

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    thing, most of the methods of bacteriological study do not even involve the use of a microscope. The unit with which the student commonly starts is not a bacterium, but a colony. By reference to experiment No. 6 it will be seen that a colony is a mass of bacteria in some solid jelly medium. (Fig. 2.) Such a colony is composed of thou- sands of bacteria, all of which are supposed to have risen from a single bacterium by multiplication. The whole makes a cluster big enough to be seen without any lens, and since all the bacteria in it have come from a single one they are all alike. The colony may be picked out of the jelly, placed in somé medium in: which the bacteria will thrive, and then, after proper growth, the bacteria can be studied by the microscope. Such cultures form the basis of bacteriological study. Form of Bacteria—Bacteria are of three quite different Bhapes, but all. very simple...1. Simple spheres. (See. Fig. 3, by ¢, ad.) ‘Such spherical forms “are called .cocct, and in
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