. Bacteria and their products. Bacteriology. CHOLERA. 153 The ' comma' bacillus, which is now regarded as belong- ing to the spirilla, usually occurs as a slightly curved rod, measuring from i to 2/« in length, with an average length of_ about ; it is .5 to .6/* in thickness, the average thickness being about one-third to one-fourth of the length. It is therefore from one-half to one-third the length of the tubercle bacillus, but somewhat thicker. In place of occurring as single rods these organisms may be grouped. Photo-micrograph cholera bacilli, x looo. Long spirilla^ comma, S and O s
. Bacteria and their products. Bacteriology. CHOLERA. 153 The ' comma' bacillus, which is now regarded as belong- ing to the spirilla, usually occurs as a slightly curved rod, measuring from i to 2/« in length, with an average length of_ about ; it is .5 to .6/* in thickness, the average thickness being about one-third to one-fourth of the length. It is therefore from one-half to one-third the length of the tubercle bacillus, but somewhat thicker. In place of occurring as single rods these organisms may be grouped. Photo-micrograph cholera bacilli, x looo. Long spirilla^ comma, S and O shaped organisms. Some involution forms. in pairs, or in larger numbers, in which case the curve may be continuous or reversed, so giving rise to the formation either of half circles or of S-shaped curves. In cultivations in meat broth the bacilli may be so grouped that they form long wavy or spiral threads, each of which may be made up of ID, 20, or even 30 short turns. Such are the characters of the organisms which Koch found,. 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 Woodhead, German Sims, Sir, 1855-1921. London [etc. ] The W. Scott Publishing Co. , Ltd
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