352 Oji Certain Bacteria from the Air of New York City. 



ish, consisting of a number of isolated colonies, each spreading with a 

 veil. In gelatin the growth along the pnnctnres is white, the surface 

 growth sinks slowly in the liiiuefaction as a pinkisli sediment. On glycer- 

 ine agar the growth is abundant, thick, smooth and of a reddish brown 

 color. Scarcely any growth on potato ; no growth at the body tempera- 

 ture. 



22. Mei'isinopedia citreus coiiglomeratiis (Bumm). 



Occurrence. In the air of the college hallway. 



Morphologij. Micrococci .9/^ in diameter, singly, in tAvos, rarely in ellipticaL 

 pair with a cross furrow. 



Biology. Gelatin liquefied quickly at first (six days), but in latter cultures 

 not till forty -five days ; nitrate reduced, partially at first, but in twenty- 

 eight days completely. Gelatin plate colonies are at first white, opaque, 

 very strongly cumular and lobed ; they are unusitally coherent and will 

 flow around in the liquefied mediiim with unaltered shape. On agar the 

 growth is white at first, later distinctly pale yellow, granular and lumpy, 

 somewhat Ijrittle and crusty to the needle. Rosolic acid is rendered a 

 little brownish but not distinctly faded. 



Eemarls. This does not tally exactly with Bumm's description of Diplococcus 

 citreus conglomeratus, but I find no positive points of difference. 



23. Itlei-isniopeclia mollis n. sp. 



Occurrence. As a contamination from the air of the laboratory. 



Morphology. INIicrcocci, sometimes a little elongate, about 1 fi in diameter,. 



singly, in paits and a few fours, in irregular chains of four to six and in 



masses; 

 Biologi). Gelatin quickly liquefied ; milk coagiilated, tlie precipitated case in 



forming a curd which is gradually dissolved. Nitrate partly reduced. 



Lactose-litmus and rosolic acid unchanged. Growth on- agar abundant,. 



shining orange color. 



24. Sai'cina flava (De Bary). 



Occurrence. (1) "'Sarcina ventriculi " from the college collection. (2) Four 

 different times in the air of the college hallway. ( 3 ) In the air in West 

 59th St. ( 4 ) Twice as a contamination from the air of the laboratory on 

 gelatin plates. ( 5 ) In a fresh leaf of the pitcher plant, Sarracenia pur- 

 purea, at Plattsburgh, N. Y., in June. 



Morphology. Micrococci about 1 w in diameter associated in cubical packets of 

 eight and larger bundles, rarely breaking up into fours. 



Biology. Gelatin usually quickly liciuefled, more rarely slowly liquefied ; 

 milk coagulated, the precipitated casein forming a curd which is gradually 

 dissolved. Nitrate not reduced or but a trace. Lactose-litmus made 

 blue ; rosolic acid not changed. Growth on agar abundant, thick, not 

 very shining, yellow ; on glycerine agar very abundant, shining bright 

 yellow. At37o°C the growth is white, but largely regains its yellow 

 color on being transferred to the room tempearture. 



