362 On Cei'tain Bacteria f 7^0111 the Air of New York City. 



58. Bacillus rliodocliroiis (Overbeck). 



Occurrence. (1) " Micrococcus rhodochrous " from Krai's laboratory. (2) 



In the air of the college hallway. 

 3IorphoJogy and biology as above, but the gi'owth is a fine pink with the free 



access of air. 



59. Bacillus brunueoflavus u sp. 



Occurrence. " IMicroeoecus brunneus " from Krai's laboratory. 

 3IorphoIogy and Biology. As in Nos. 57 and 58 but the growth is 1)right 

 orange. There is a slight reduction of nitrate ; rosolic acid not changed. 

 Remarks. Does not correspond with Bacillus bnttnieus Adametz. 



60. Bacillus flarocoriaceus ( Eisenberg ). 

 Occiirrencp. In the air of the college hallway. 

 Morphology. Very short bacilli, regular and uniform, .5X-~«) singly or in 



chains of two or three ; not motile. 

 Biology. Characters all negative. Grows well on glycerine agar, but not on 



potato or at 37i° C. 

 Remarks. The gelatin colonies are not coarsely granular, but smooth. In 



other respects, the description of Eisenberg is not contradictory. 



61. Bacillus zuiiiianiiiu (List). 



Occurrence. In the air of the college hallway. 



Morphology. Small rounded bacilli, .5X-6-1a<, singly or in short chains, not 

 motile. 



Biology. A very slight reduction of nitrate. Cultures on solid media trans- 

 lucent white, very viscous, drawing out into long threads. Does not 

 produce indol in peptone-salt solution. 



Remarks. These bacilli are not as long as B. ziirianum List but seems to cor- 

 respond otherwise. 



62. Bacillus decolorans major n. sp. 



Occurrence. (1) In the air of an apartment house on West 69th Street. (2) 

 In the air of the college hallway. 



3Iorphology. Very short rounded bacilli .7-.9;<l-2,«, singly or in chains of 

 various lengths, not motile. 



Biology. As in Xo. 61, except that the gro\vth is not in the least viscous, and 

 indol is formed in the peptone-salt liroth. Tlie decolorization of rosolic 

 acid does not take place at once but is complete in from sixteen to twenty- 

 five days. 



Remarks. Differs from No. 45 in that the cells are larger and that nitrate is 

 not reduced or but partially so. 



63. Bacillus zopfii (Kurth). 



Occurrence. (1) " Bacterium zo])fu "" from the college collection. (2) "Pro- 

 teus zenkeri " from the college collection. (3) "Proteus mirabalis " 



