BACTERIA, NOT CLASSIFIED. 



733 



488. MICROCOCCUS AGILIS CITREUS. 



Obtained by Menge (1882) from an infusion of peas probably from the 

 air. 



Morphology. Micrococci, usually in pairs, but sometimes in short chains 

 or irregular groups. Has a flagellum which is easily demonstrated by 

 Lomer's method of staining, and which is about six times as long as the 

 diameter of the micrococcus. 



Biological Characters. An aerobic, non-liquefying, chromogenic, motile 

 micrococcus. Forms a yellow pigment. Grows in the usual culture media 

 at the room temperature. Upon gelatin plates a diffuse cloudiness of the 

 gelatin occurs around the superficial colonies and extends over the plate, ex- 

 cept at the numerous points where bundles of crystals are developed. In 

 gelatin stick cultures a scanty growth occurs along the line of puncture, 

 which is not colored ; upon the surface a round layer of an intense yellow 

 color is slowly developed. Upon agar a pale and thin layer is developed 

 along the line of inoculation by the end of the third day ; this increases in 

 breadth and thickness and acquires a yellow color ; the growth upon agar 



FiG. 268. 

 X 1,000. From a photomicro- 



FIG. 267. 



Fio. 267. Bacillus gracilis cadaveris, from a gelatin culture. 

 graph. (Sternberg.) 



FIG. 258. Bacillus gracilis; colonies in gelatin roll tube, end of forty -eight hours. 

 a photograph. (Sternberg ) 



X 12. From 



is extremely viscid and may be drawn out into long threads when touched 

 with a platinum needle. In bouillon a diffuse cloudiness occurs and a yellow, 

 viscid deposit accumulates at the bottom of the tube; there is no film 

 formed upon the surface. Upon potato development is very slow, but after 

 a time an abundant bright-yellow layer is formed, and around this the 

 potato acquires a slightly bluish-gray color. Grows in milk without pro- 

 ducing coagulation. Grows best at a temperature of 20 C. 



489. BACILLUS GRACILIS CADAVERIS (Sternberg). 



Obtained (1889) from a fragment of liver, of man, kept for forty-eight 

 hours in an antiseptic wrapping. 



Morphology. Bacilli about 1 n broad and 2 / long, associated in long 

 chains. 



Biological Characters. An aerobic and facultative anaerobic, non- 

 motile, non-liquefying bacillus. Spore formation not observed. In gelatin 



63 



