. Laboratory work in bacteriology. Bacteriology. 36 BACTERIOLOGY. delicacy they can only very rarely be seen in the living' condition. Moreover, they do not color with anilin dyes in the same way as the mass of the bacterial cell, and for that reason they are not visible in the ordinary stained prepara- tion. In order to demonstrate the presence of flagella or whips it is necessary to resort to a very special method of staining. They then appear as slender, wavy filaments. It is the lashing of theSe whips that propels the organism through the Motile organs or whips on bacteria
. Laboratory work in bacteriology. Bacteriology. 36 BACTERIOLOGY. delicacy they can only very rarely be seen in the living' condition. Moreover, they do not color with anilin dyes in the same way as the mass of the bacterial cell, and for that reason they are not visible in the ordinary stained prepara- tion. In order to demonstrate the presence of flagella or whips it is necessary to resort to a very special method of staining. They then appear as slender, wavy filaments. It is the lashing of theSe whips that propels the organism through the Motile organs or whips on bacteria. «—Micrococcus; b—Bacillus witli term- inal whips; c—Bacillus with diffuse whips; d—Vibrio; e—Single spirillum with bunch of whips; /^Spirillum after division with whips at each end. The fiagella will vary considerably in size in different species, and even at times in individuals of the same spe- cies. Their width is usually less than sV of the width of of the cell. Their length will usually be two or three times the length of the cell, but it is not uncommon to find some bacteria with whips that are ten or twenty times as long as the cell. The flagella project from the outer border of the organ-, ism. They are supposed by some to be directly continuous with the protoplasm within, the cell. In that case the protoplasmic threads are supposed to pass through minute openings in the cell-wall. Plasmolytic experiments, how- ever, do not indicate a protoplasmic continuity. On treatment with saline solutions, as indicated above, the protoplasm of the living cell withdraws completely from the cell-wall and gathers in one or two round masses. If. 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 Novy, Frederick George, 1864- . Ann Arbor [Mich. ] G. Wahr
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