A system of surgery . scent (). On potatoes rusty-looking colonies are formed ;these, when moistened with dilute ammonia, becomegreen, or with dilute acids, red. A bluish colour-ing matter—pyocyanin—and a fluorescent greenishpigment have been separated. These organisms, when injected in considerablequantity, either subcutaneously or intraperitoneally,are pathogenic for both guineapigs and rabbits, set-ting up an acute oedema, purulent infiltration, orpurulent peritonitis, as the case may be, the bacillusbeing found in the blood and in the fluids drawn offfrom the affected areas. Given in
A system of surgery . scent (). On potatoes rusty-looking colonies are formed ;these, when moistened with dilute ammonia, becomegreen, or with dilute acids, red. A bluish colour-ing matter—pyocyanin—and a fluorescent greenishpigment have been separated. These organisms, when injected in considerablequantity, either subcutaneously or intraperitoneally,are pathogenic for both guineapigs and rabbits, set-ting up an acute oedema, purulent infiltration, orpurulent peritonitis, as the case may be, the bacillusbeing found in the blood and in the fluids drawn offfrom the affected areas. Given in smaller quanti-ties, it sets up local suppuration; but the animalusually recovers, and remains protected against theaction of considerably larger Proteus vulgaris.—Another organism of some surgicalinterest is the Proteus vulgaris, one of the commonest of the putrefac-tive bacteria. It is a bacillus with rounded ends from 1*25^ to 3-75yuin length and -(jfi in breadth, occurring either as oval forms or as. Fig. 6. — Cultiva-tion of BacillusPyocyaneus. SAPROPHYTIC BACTERIA. 43 more distinct bacteria, usually in pairs, or in longer straight or spiralfilaments. There are also numerous involution forms. This organismis very motile, and possesses long cilia, and is probably the mostimportant of all those organisms at one time included under theterm Bacterium termo. On weak gelatine the colonies have usually a yellowish-browncolour, and from the margins of the main mass of the colony branchesforming a network shoot off in a characteristic manner, until thewhole surface of the gelatine may be covered with zooglcea masses ofconsiderable size. In tube cultures the liquefied gelatine is cloudyalong the puncture, although a great part of the culture sinks to thebottom; eventually the whole of the gelatine becomes agar-agar, at the room temperature, a rapidly-growing, moist,greyish-white coating is formed, and a similar moist but much dirtier-looking layer on bl
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