. Agricultural bacteriology; a study of the relation of germ life to the farm, with laboratory experiments for students, microorganisms of soil, fertilizers, sewage, water, dairy products, miscellaneous farm products and of diseases of animals and plants. Bacteriology, Agricultural. GENERAL CHARACTERS OP BACTERIA 13 Classification,—Unfortunately different systems of classifica- tion are used by different bacteriologists. To learn them all would be of little use to the student of agricultural bacteriology; but the various classifications have certain points in coimnon and it is important to lea
. Agricultural bacteriology; a study of the relation of germ life to the farm, with laboratory experiments for students, microorganisms of soil, fertilizers, sewage, water, dairy products, miscellaneous farm products and of diseases of animals and plants. Bacteriology, Agricultural. GENERAL CHARACTERS OP BACTERIA 13 Classification,—Unfortunately different systems of classifica- tion are used by different bacteriologists. To learn them all would be of little use to the student of agricultural bacteriology; but the various classifications have certain points in coimnon and it is important to learn them. Bacteriologists are quite generally agreed upon the following groups: Spherical Bacteria (cocci): Streptococcus divides in one plane, so as to form chains (Fig. 9, d). Micrococcus divides in two planes and does not form chains (Fig. 9, c). Sarcina divides in three planes, forming cubical masses (Fig. 9^ e). Also other names, such as Diplococ- cus for the cocci that occur in twos, -, CH, -, r c 1 1 ^^^* 9'—Showing different and Staphylococcus for the patho- types of cocci, a, 6. and c genie cocci, are often used. Ys^cin^'" ^* Streptococci; Ron-SHAPED Bacteria: Bacillus produces spores and has peritrichic flagella. Pseudomonas does not produce spores, and has its flagella all at one ead (monotricMc or lophotrichic). Bacterium has no spores or flagella. Having no flagella it is immotile. Some spore-producing rods have no flagella, and some peri- trichic rods produce no spores. Bacteriologists disagree as to whether to call these forms Bacterium or Bacillus. In this book we shall follow the usage of Migula who placed the former in the genus Bacterium., the latter in the genus Bacillus, Spiral Bacteria: Spirillum forms one or more complete corkscrew turns. Vibrio forms only part of one turn. Higher Bacteria (Cladothrix, Actinomyces, and others) (Fig. 10): Under this head are included several kinds of microorganisms intermediate between bacteria and higher fimgi. Un
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbacteriologyagricult
