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



3IorphoJogij. Micrococci 1-1.5 ,« in diameter, often seen constricted for division, 

 singly or irregularh' grouped. 



Biology. The growth on solid media is white, not very opaque ; a white sedi- 

 ment in broth ; rosolic acid not changed. The gelatin colonies are round, 

 uncharacteristic, the deep and surface ones much alike. 



10. Merisiiiopedia ceriviseae (Balcke). 



Occurrence. (1) "Sarcina flava " from Krai's laboratory. (2) In the air of 



the college hallway. 

 3Iorpholo(jy. Micrococci . 7-1. 5, « in diameter, singly, in pairs, rarely in fours, 



in masses. 

 Biology. Nitrate is strongly reduced, the full deep color of the test being 



shown in from six to fourteen days ; rosolic acid unclianged. In broth, 



a granular precipitate. On solid media the growth is white or very 



faintly yellowish (2), moderately opaque. 

 Remarks. Tliese cultures seem not to be contradicted by the description of 



Pediococcus ceririseae. 



11. ]Werisniopedia liavanieiisis (Sternberg). 



Occurrence. (1) From the college collection. (2) In the air of the college 

 yard near 59th St. 



Morphology. Micrococci, slightly elliptical, often with cross furrows. ,1-1 fi 

 in diameter, in twos, fours, or ])reaking apart into irregular chains. 



Biology. Nitrate is slightly' reduced, never strongly ; growth on solid media 

 is red and a fine red surface growth occurs on milk without affecting the 

 medium preceptibly ; a granular precipitate in broth. 



Remarks. This is the Bacillus havaniensis of Sternberg ; but I have preferred 

 to associate it with the ilicroeocci on account of the grouping of the ele- 

 ments. 



Liquefying Mickococci. 

 (Synopsis of species). 

 Lactose-litmus reddened. 



;Milk coag\ilated ; nitrate not reduced. 

 Large ^Micrococci, growth on agar lobed. 



Growth orange colored 12 



Growth cream colored 13 



Growth white 14 



Smaller ^Micrococci, growth normal. 

 Associated in masses. 



Growth orange ^ 15 



Growth Avhite. 



Qiiickly liquefying 16 



Slowly and imperfectly liquefying 17 



Associated in pairs and fours 18 



Milk not coagulated. 

 Nitrate not reduced. 



