On Certain Bacteria from the Air of N%w York City. 353 



Eemarks. I find no characters to seperate Sarcina lidea Schroter from this 

 species. It appears to liqnify gelatin more slowly ; hut the cultures ])efore 

 . me vary greatly in this respect. One produced only a dry cup-shaped 

 hollow in twenty-eight days, from which the fluid at first formed had 

 evaporated. The more usual form rendered the upper one-third or two- 

 thirds of the gelatin fluid in t\\enty-eight days. 



25. Micrococcus ilissiniilis n. sp. 



Occurrence. " Micrococcus of trachoma, Sattler " from Krai's laboratory. 



3forpJwIogij. IMicrococci 1 // in diameter, associated in irregular masses. 



Bioloff!/. Gelatin (juickly liquefied ; milk coagulated, forming a flaky curd 

 with milky whey ; nitrate reduced, hut not thoroughly before twenty-eight 

 days ; lactose-litmus and rosolic acid unchanged ; opaque white or agar, 

 not viscid ; surface colonies round, opacjue, like deep ones but surrounded 

 by an obscure granular veil ; no surface growth on broth. No growth on 

 potato. 



Hemarls. This does not agree with the description of the Micrococcns of 

 trachoma. 



26. Micrococcus niobilis (Maurea). 



Occurrence (1) Twice in the air of the college hallway. (2) Twice in the 

 air on 59th St. 



3Iorphology. ^licrococci 1-1.5// in diameter, singly, rarely in pairs. Each cell 

 possesses a single long flagellum which may be demonstrated by Lcilfier's 

 method of staining ; actively motile. 



Biology. Gelatin quickly liquefied, or, in one instance, slowly and imper- 

 fectly ; rosolic acid not changed. On agar the growth is translucent, 

 obscure, where collected in a thicker layer reddish orange. On glycerine 

 agar and at ST; ° scarcely any growth occurs ; growth on potato 'sery slight, 

 pale orange. In absence of free access of air, the growth is whitish. 



Eemarks. I take this to be the Sarcina moMIis of Maurea. 



27. Micrococcus a^ilis (Ali-Cohen). 



Occurrence. From the college collection. 



Morplwlogij and biology as above (No. 26), but the growth is pink instead of 

 orange color and is thicker and more opaque on agar. 



28. Sarcina aurantiaca (Koch). 



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

 hallway. 



Ilorjjhylog;/. ]\Iicrococci .8-1.2 /' in diameter, in twos, fours, and masses, occa- 

 sionally forming true- packets. 



Biology. Gelatin quickly liquefied! 1) or slowly and imperfectly (2). Niti-ate 

 not reduced, or a slight trace of reduction. On agar the growth is-*dark 

 orange colored, not very- shining. Rosolic acid not changed.-- Iiv-br^th 

 no surface growth, the sediment jellowi-sh or Avliite. ■ 



