On Certain Bacteria from the Air of New York City. 367 



72. Bacillus circulans (Jordan). 

 Oci-Kireiia . In the air of the colleoe hallway. 



Moiplinlngii. Large ha^lli with rounded ends, .6Xl-2«, mostly singly ; motile. 

 Biohifiji. Gelatin rather slowly liquefied ; milk not coagulated ; nitrate very 



slightly reduced in twenty-eight days ; rosolic a«id not decolored ; forms 



a little indol. Crrowth on agar thin and ti'anslucent. 



73. Bacillus Sclieurleui (Sternberg). 



Occurrence. In the air on West 59th Street. 



3Tnrplioh)fj!i. Large rounded bacilli, .7-1X1-2.5/', singly and in short chains 



motile ; forms spores. 

 Biolof/i/. CJelatin quickl}- liquefied ; rosolic acid not changed, forms no indol, 



nitrate very slightly reduced in twenty-eight days. 

 Remarks. Ajiparently corresponds to the "Bacillus of Scheurlen " described 



in Sternberg's manual. 



74. Bacillus incanus (Pohl). 



Occurrence. In a leaf of Sarracenia purpurea at Plattsburgh, N. Y. 



Mnrphftlofiji. Small rounded bacilli, .4-.5X-6-1m, iisually in short chains, not 

 motile, does not form spores (115 days on agar). 



Biohigi]. Gelatin liquefied rather slowly, nitrate slighly reduced, rosolic acid 

 not changed ; growth on agar translucent white, not broad, irregularly 

 streaked. 



RemarlcH. I have identified this with B. inennuf!, though with some hesitation, 

 as that species is said to be slightly motile, and the growth on agar is de- 

 scribed as granular. 



75. Bacillus fluorescens nivalis (Schmolck). 



Occurrence. In the exudate from a sick lepidopterous larva {Scolioptery.c lih- 

 otrix) at Keene Valley, N. Y. 



Morpholofjij. Rather slender bacilli, .5-.7X1-3", mostly singly, actively mo- 

 tile. 



Biolor/i/. Gelatin quickly liqiiefied ; rosolic acid nearly decolorized in sixteen 

 days ; nitrate not reduced ; growth on agar thin and translucent, a fine 

 greenish fluorescence in the medium. 



RemarL-^. Differs from No. 109 in not reducing nitrate. I have identified this 

 as above rather than describe it as new, though there is nothing in the 

 description to differentiate it from No. 109. 



76. Bacillus gamma n. sp. 



Occurrence. In the air of the college yard, near West 59th Street. 



Morpliolof/i/. Bacilli associated in thick adherent masses, .5-.7X1-1-5/', mo- 

 tile, in old cultures many snuill spherical forms are seen. 



Rioliii/i/. Milk not coagiilated, but tlie casein ultimately dissolved ; lactose- 

 litmus is made blue, though sometimes this is obscured by the decoloring 

 effect ; nitrate not reduced, rosolic acid not changed. The species is 



