364 On Certain Bacteria from the Air of New York City. 



the characters uniformly in all cases, and I think we may learn as much 

 from cases where separations apparently fail to he niade as where they 

 come out unexpectedly. 



66. Bacillus caiidicans (Frankland). 



'.Occurrence. (1) Twice in the air of West .59th Street. ('2) In the air of the 



college (Dr. Cheesman). (3) A contamination, from the air? 

 ■Morphology. Short rounded bacilli, .5-.8X-8-1.3u, singly or in twos or threes; 



not motile. 

 Eemnrks. Resembles No. 62, but rosolic is not decolored. 



67. Bacillus Martinezii (Sternberg). 

 Occurrence. A contamination from the air of the college laboratory. 

 Morphology. Rounded bacilli, .5'Xl-l.biJ-, singly or in short straight chains ; 



not motile. 

 Biology. Nitrate slightly reduced in twenty-eight days ; rosalic acid deepened 



in color ; growth on agar translucent white. Gelatin colonies are large, 



irregular streaked, almost reticulated, with irregular edge ; the mass has 



a veriform appearance. 

 Remarks. As Sternberg's description does not seem to contradict this culture 

 , in any essential feature, I have applied his name to it, though I have no 



other reason for supposing them to be the same. 



68. Bacillus inutilis n. sp. 



Occurrence. Tliree colonies on some plates exposed to the air in West 59th 



Street, and grown at BTJ" C. 

 Morphology. Short, rounded bacilli, rather large, 1X1-2,m, singly and in pairs. 

 Biology. Characters all negative, growth forms uncharacteristic, on solid 



media very thin, translucent ; grows both at room temperature and at 



37h° C. 



Liquefying Bacilli. 



( Synopsis of species. ) 



Nitrate not reduced or but very slightly. 

 Milk not coagulated. 



Lactose-litmus not reddened. 

 Not chromogenic. 



Large bacilli, .5/< wide or more ; form spores. 



Growth skinny ; a surface skin on broth ( see 88 and 89) . 

 Growth not skinny or crusty. 



Growth viscous ; not motile SS' 



Growth not viscous ; motile. 



Shining transluent ^vhite on agar. 



No growth on potato 70 



Growth on potato abundant, but nearly invisible. . 71 

 Very thin and transparent on agar 



No growth on potato 72 



An abundant growth on potato like IjroAvn varnish . 73- 



