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Bergey's Manual of Determinative Bacteriology

The bacteria are a group of great diversity with a procaryotic cellular organization. Classification of bacteria based on structural and functional attributes although attempted has been difficult. Active interest in classifying bacteria led Chester in 1899 and 1901 to publish the manual of determinative bacteriology. This manual subsequently was modified by David Bergey into what is now known as Bergey's manual of Determinative Bacteriology which is the major treatise on bacterial taxonomy since its first publi. cation in 1923.

Based on a variety of parameters, the first edition arranged bacteria- into families, orders and tribes. This has been modified subsequently and in the 8th edition published in 1974, a more empincal approach has been followed for classification. Kingdom Procaryotae has been divided into two divisions.

The division I contains cyanobacteria. This division has not been further considered in this mannual. The division II named the bacteria is further divided into 19 parts and each is distinguishable by a few readily determinable criteria. Because of the persisting difficulties in establishing relatedness among bacteria, only in some parts the constituent genera are grouped into families and into orders. In several others this has not been possible.

Nonetheless, Bergey's manual provides an effective system of keys for determining the genetic position of an unknown organism. We have briefly summerizes the classification of bacteria (Division II) upto the generic leyel as published in the 8th edition of Bergy's manual

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