. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. 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 fonnerly attributed to chemical stimulus. Consult Jennings, " Contributions to the study of the behavior of lower organisms," Carnegie Institution of Washington, 1904, and especiall)-Jennings and Crosby, "The manner in which bacteria react to stimuli, especially to chemical stimuli," Am.
. Bacteria in relation to plant diseases. Bacteriology; Plant diseases. 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 fonnerly attributed to chemical stimulus. Consult Jennings, " Contributions to the study of the behavior of lower organisms," Carnegie Institution of Washington, 1904, and especiall)-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. RE.'^CTION TO STAINS. Proper staining is a vers' 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 aflfinity, 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 afl!inity for stains until acted *FiG. 25.—Hand Jens suitable for examining bacterial cultures. Zeiss aplanat magnifyino- six times. Tihree-fourt'hs 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 Smith, Erwin F. (Erwin Frink), 1854-1927. Washington, D. C. , Carnegie Institution of Washington
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