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



1. Merisinopedia flava varians n. sp. 



Occurrence. Abundantly in a jar of "sterilized milk" bought at a store; 

 with no. 101. 



Morphology. Alicrococci about 1 // in diameter, in twos, fours or in elliptical 

 pairs with a cross-furrow. 



Biology. Gelatin not liquified in 60 days; milk coagulated on Ijoiling in 6 

 days, more evidently later, but not without boiling; nitrate quickly and 

 strongly reduced even in 7 days; lactose-litmus quickly reddened, but in 

 50 to 60 days it becomes blue at the upper part of the culture ; aerobic. 

 In broth there is a fine turljidity and considerably granular yellow sedi- 

 ment; on the solid media a broad pale yellow layer is developed, which 

 may vary in shade, even in different parts of the same culture; on gly- 

 cerin-agar and potato the growth is abundant, shining l)right yellow, 

 opaque. In gelatin plates the surface colonies are much larger than the 

 deep ones, opaque, scarcely shining, light yellow, the edges a little wavy; 

 the deep colonies are round, opaque, yellow, inclined to be slightly irre- 

 gular. 



2. Jtlerisiuopedia ciiiiiabareus (Fliigge). 



Occurrence. In the air of the College hallway. 



Morphology. ISIicrococci about 1 // in diameter, in twos, fours or in elliptical 

 pairs with a cross-furrow. 



Biology. IMilk is not coagulated at first, but in twenty-one days a soft cheese 

 is formed which boils up into a very fine coagulum scarcely peceptible. 

 Nitrate is only very slightlj^ reduced in twenty-eight days. Eosalic acid 

 is not changed. On agar, the growth is not abundant, brownish red, 

 almost orange. Gelatin colonies are all alike, round, orange colored. 



Beniarks. I may be mistaken in identifying this as Fliigge's species {Micro- 

 coccus cinnabarens ) . 



3. Micrococcus caiidicaiis (Fliigge). 



Occurrence. A culture from Krai's lal)oratory. 



Morphology. INIicrococci 1-1.25 /^ in diameter, singly, in pairs or gToui)S. 



Biology. ISIilk was not coagulated when the culture was first received. A year 

 later a coagulation was formed on boiling at the end of twenty-six days ; 

 again a solid curd was formed in this time. Nitrate is slightly reduced, 

 the test giving a faint color in twenty-eight days. The growth is white 

 and opaque on solid media, no surface growth in liquid media. Surface 

 colonies are thin, the deep ones round and opaque, white. Rosolic acid 

 is not changed. 



4. Micrococcus rosettaceus (Zimmermann). 



Occurrence. " Micrococcus aurantiacus " from Krai's laboratory. 



Morphology. iSIicrococci .7-.8/-t in diameter, associated in masses. 



Biology. Milk is coagulated (on boiling) in fourteen days, and does not change 

 up to twenty-eight days. Growth on solid media is shining white, 

 opaque, soft ; no surface growth on broth. liosolic acid unchanged. 



Remarks. This is nearest to M. rosettaceus, though perhaps not identical. 



