. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE AND STRUCTURE OF MICROORGANISMS The cell is the unit of life. This consists of an outer mem- brane containing within it a semi-solid mass of protoplasm. Higher plants and animals are composed of millions of these 99 0000000 ^J o^ YiG, 4.—^The normal types of bacteria. 1-6y cocci; J-xSi bacilli5 14-163 spirilla; j, micrococcus; 2 and 5, diplococci; 4, tetracoccus; 5, sarcina; 6; streptococcus (the lower chain includes an arthrospore) j 7 and St bacilli, p, to J 12 and jj, bacilli with various
. Bacteria in relation to soil fertility. Soil microbiology; Bacteriology, Agricultural. SHAPE AND STRUCTURE OF MICROORGANISMS The cell is the unit of life. This consists of an outer mem- brane containing within it a semi-solid mass of protoplasm. Higher plants and animals are composed of millions of these 99 0000000 ^J o^ YiG, 4.—^The normal types of bacteria. 1-6y cocci; J-xSi bacilli5 14-163 spirilla; j, micrococcus; 2 and 5, diplococci; 4, tetracoccus; 5, sarcina; 6; streptococcus (the lower chain includes an arthrospore) j 7 and St bacilli, p, to J 12 and jj, bacilli with various granules, ji, streptobacillus; i4j vibrio, 1S3 spirillum; 16, splrocheta trenema (after Kendall). The bacteria are single-celled organisms and in shape have the very simplest conceivable structure. Although there are thou- sands of bacteria having many v^ide variations in properties, yet they all have three general forms—^rod-shaped, spherical, and spiral. Shape of Bacteria.—^The rod-shaped bacteria are cylindrical organisms which may be compared to an unsharpened lead pencil. Some have rounded ends, others straight, v^hereas still others have the ends hoUov^ed out. The size also varies, some being so short that it is impossible to tell v^^hether they are rods or globular or- ganisms. All rod-shaped organisms are knov^^n as bacilli (singu- lar, bacillus). Another type of bacteria is the spherical, vi^hich may be likened to a baseball or at times to an tgg. They are known as. 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 Greaves, Joseph Eames, 1880-; Greaves, Ethelyn O. , joint author. New York, D. Van Nostrand Co.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectbacteriologyagricult
