. Carnegie Institution of Washington publication. . Fig. On the general subject of chemotropism, see papers by Pfeffer, Miyoshi, Jennings, Buller, Rothert, etc. Jennings maintains that contact irritation inducing motor reflex is responsible for movements which were formerly attributed to chemical stimulus. Consult Jennings, " Contributions to the study of the behavior of lower organisms," Carnegie Institution of Washington, 1904, and especially Jennings and Crosby, "The manner in which bacteria react to stimuli, especially to chemical stimuli," Am. Jour. Physiol., Vol.
. Carnegie Institution of Washington publication. . Fig. On the general subject of chemotropism, see papers by Pfeffer, Miyoshi, Jennings, Buller, Rothert, etc. Jennings maintains that contact irritation inducing motor reflex is responsible for movements which were formerly attributed to chemical stimulus. Consult Jennings, " Contributions to the study of the behavior of lower organisms," Carnegie Institution of Washington, 1904, and especially Jennings and Crosby, "The manner in which bacteria react to stimuli, especially to chemical stimuli," Am. Jour. Physiol., Vol. VI., pp. 31-37, and Jour. Roy. Mic. Soc., 1902, p. 88. Spirillum volutans was used in the tests. REACTION TO STAINS. Proper staining is a very important part of the study of bacteria. Its founda- tion principle is the fact that the bacteria, in a living vegetative condition, all show a great affinity for the basic anilin dyes. Spores ordinarily show no such affinity, but may be made to take up stains by acting on them with strong acids or alkalis, or by heating them very hot. Flagella also show no affinity for stains until acted *Fic. 25.—Hand Jens suitable for examining bacterial cultures. Zeiss aplanat magnifying six times. Three-fourths natural size. tFig. 26.—Zeiss swing-cover aplanat magnifying six times. This is now sent out in a neat little chamois-skin purse. About two-thirds natural 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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