Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . g. 60). The growth never becomesmore prominent; the potato /^^^^^^^^w must have a neutral or acid * ~ ??^- reaction. On Potato Gelatin.—^The colo-nies do not have the yellowcolor; they are transparent;later on they become darkbrown with green iridescence. Milk. — The bacteria growvery well in milk, producing aslightly acid reaction, but nocoagulation. Fermentation Tube.—^In sugarbroth, in the fermentation tube, acids are formed without gas. Glucose Gelatin.—^In glucose
Essentials of bacteriology; being a concise and systematic introduction to the study of bacteria and allied microörganisms . g. 60). The growth never becomesmore prominent; the potato /^^^^^^^^w must have a neutral or acid * ~ ??^- reaction. On Potato Gelatin.—^The colo-nies do not have the yellowcolor; they are transparent;later on they become darkbrown with green iridescence. Milk. — The bacteria growvery well in milk, producing aslightly acid reaction, but nocoagulation. Fermentation Tube.—^In sugarbroth, in the fermentation tube, acids are formed without gas. Glucose Gelatin.—^In glucose gelatin there is no gas-produc-tion. Indol is likewise not generated by the typhoid bacillus,whereas it is by the colon bacillus. Staining.—Colored with the ordinary anilin dyes, whenthey are warmed; since they are easily decolorized, acidsshould be avoided. Gram negative. Distribution.—Outside of the body it is rarely or enteric fever is a general infection, but affectingchiefly the Peyers patches of the intestine. The bacilh arefound in the intestinal glands and in the enlarged and deeply. -*.l Fig. 59.—Colonies of typhoidbacilli three days old (Xioo)(Frankel and Pfeiffer). 138 ESSENTIALS OF BACTERIOLOGY congested spleen. Metastatic abscesses form in various partsof the body, and here likewise the organisms abound. Theyoccur in the feces only in small numbers, more commonly inthe urine. The urine may contain active baciUi for weeksafter recovery from the fever. Typhoid Bacilli in Water.—^Although all evidence showsthat the water-supply is a frequent source of infection, veryfew persons have ever isolated the typhoid bacUlus from such
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