. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. t liquefied. Onagar, growth is somewhat more delicate than that of the average coloncultures. 274 THE DYSENTERY BACILLUS GROUP. 275 On Potato.—A delicate growth just visible or distinctly brownish. In Bouillon.—Diffuse cloudiness with sHght deposit and sometimesa pellicle. Indol not produced or in a trace only. In glucose bouillon no production of acid or gas. Neutral red agar is not blanched. In Litmus Milk.—After twenty-four to forty-eight hours this be-comes a pale
. Pathogenic micro-organisms, including bacteria and Protozoa; a practical manual for students, physicians and health officers. t liquefied. Onagar, growth is somewhat more delicate than that of the average coloncultures. 274 THE DYSENTERY BACILLUS GROUP. 275 On Potato.—A delicate growth just visible or distinctly brownish. In Bouillon.—Diffuse cloudiness with sHght deposit and sometimesa pellicle. Indol not produced or in a trace only. In glucose bouillon no production of acid or gas. Neutral red agar is not blanched. In Litmus Milk.—After twenty-four to forty-eight hours this be-comes a pale lilac. Later, three to eight days, there is a return tothe original pale blue color. The milk is not otherwise altered inappearance. Pathogenesis.—Animal Tests.—No characteristic lesions have fol-lowed swallowing large quantities of bacilli. Dogs at times havehad diarrhoea with slimy stools, but section showed merely a hyperemiaof the small intestine. Many animals are very sensitive to bacilli injected into vein orperitoneum; mg. of agar culture injected intravenously produced Fig. 97 Fig. 98 ; * » * I . 4.
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