. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. 153 GENERAL BIOLOGY OE MICRO-ORGANISMS tached after cell-division, forming groups of two, diplo-hacillus, or many cells remain attached, to form long threads, strepto- bacillus. Endospore formation occurs almost exclusively in the bacteriaceae and the form of the spore-bearing cell differs for different species and is .fairly constant for any one tQ3 Pig. 67.—Position of spores; resultant forms (diagrammatic), a. Me
. Pathogenic micro-organisms. A text-book of microbiology for physicians and students of medicine. (Based upon Williams' Bacteriology). Bacteriology; Pathogenic bacteria. 153 GENERAL BIOLOGY OE MICRO-ORGANISMS tached after cell-division, forming groups of two, diplo-hacillus, or many cells remain attached, to form long threads, strepto- bacillus. Endospore formation occurs almost exclusively in the bacteriaceae and the form of the spore-bearing cell differs for different species and is .fairly constant for any one tQ3 Pig. 67.—Position of spores; resultant forms (diagrammatic), a. Median spores; b, intermediate spores; c, terminal spores; 20, 6, c, change in form of cells due to the presence of the sp ore; 20, Clostridium; 2C, drum-stick form. {After Novy.) The spore, which is always single, may be located at the center of the cell, median spore, or at the end, terminal spore, or at an intermediate point. The spore-bearing cell may retain its normal outline or it may be bulged by the spore. The cell containiiig a median spore with bulging is carlled a Clostridium; one with terminal spore with enlargement of the cell is spoken of as a drum- stick or sometimes as a plectridium. Spiral Bacteria.—The screw-shaped bacteria, Spirillacece, have been subdivided into four genera by Migula. The genus Spiro- soma includes those spirals which are rigid and without motility. Motile cells possessing one, two or three polar flagella are classed in the genus Microspira; while those possessing: more than three are put in the genus Spirillum. The genus Spirochaeta includes the slender flexuous forms of spirals. SPIRILLACECE—Cells circular in cross-section but curved to form a spiral or segment of a spiral. Spirosoma^—Cells rigid, without flagella, motionless. Microspira—Cells rigid, motile, with i to 3 polar flagella. Spirillum—Cells rigid, motile, with polar tufts of flagella. Spirochaeta—Cells slender, flexuous, Please note that these images are ext
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