. Laboratory work in bacteriology. Bacteriology. FORM AND CLASSIFICATION OF BACTERIA. 17 as budding'. They are designated by the term blastmny- cetes. A great many elaborate attempts have been made at classifying bacteria. Owing to their extremely minute size it is, as a rule, impossible to follow out the life-history of each individual species. The characteristic development of the fruit-organs in higher plants affords a basis for a natural classification whereby the various species are grouped into genera and families. Such a classification is natural, because it brings together the various
. Laboratory work in bacteriology. Bacteriology. FORM AND CLASSIFICATION OF BACTERIA. 17 as budding'. They are designated by the term blastmny- cetes. A great many elaborate attempts have been made at classifying bacteria. Owing to their extremely minute size it is, as a rule, impossible to follow out the life-history of each individual species. The characteristic development of the fruit-organs in higher plants affords a basis for a natural classification whereby the various species are grouped into genera and families. Such a classification is natural, because it brings together the various individuals which possess the same structure and development. Inas- much as bacteria are unicellular it follows that they do not possess definite fruit-organs, and owing to their size very little indeed can be said of their structure. The various classifications proposed are based upon characteristics such as form, size, manner of division, presence of spores, motion, number and arrangement of whips, etc. It is evi- de^t, therefore, that all such systems of classification are more or less artificial. For practical purposes it is sufficient to divide bacteria according to their external form into three groups. These are: Micrococci, or spherical bacteria; Bacilli, or rod-like bacteria; Spirilla, or screw-shaped bacteria. O o. i Fig. i. 3—Micrococcus; *—Bacillus: In a few instances special names are applied to certain forms of one or another of these three primary types. Thus, the term Mcterium is occasionally applied to a very short bacillus. It has the same significance as the word coccobacillus,. which indicates that the organism may at 2. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Novy, Frederick George, 1864- . Ann Arbor [Mich. ] G. Wahr
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