3G6 On Certain Bacteria from the Air of New York City. 



Color blackish violet 99 



Faintly chromogenic, creamy when old. 



Growth moderately opaque : no fluorescence, 



Growth smooth, shining 100 



Growth coarsely granular, the lobed jiarts nearlj' smooth . . . 101 



Granular punctate A\ith impressed wrinkles ; no lohes 102 



Growth rather thin ; a gi'een fluorescence 103 



Milk not coagulated ; if apparently so, no firm coagnihim on boiling. 

 Yellow; milk often distinctly coagulated in the cold, but not on 

 boiling. 



Lactose-litmus made blue. 



Growth, soft, smooth, shining. 



Gelatin quickly liquefied 104 



Gelatin slowly liquefied 105 



Growth lumpy, gTaimlar 106 



Growth heavily creased (convex) 107 



Lactose-litmus reddened ; growth viscous 108 



A green fluorescence in the medium 109 



Bright orange ; growth forming a crusty skin 110 



Faintly chromogenic or not. 



Rosolic acid unchanged or darkened Ill 



Rosolic acid decolorized 112 



69. Bacillus verm iciilosus (Zimmermann. ) 



Occurrence. From Krai's laboratory. 



3IorpfioJoffi/. Square ended bacilli, 1X2-4//, singly or in chains, not motile. 



Biology. Gelatin slowly liquefied, not complete in twenty-eight days ; usually 

 begun in fourteen days. The growth on ag^ir is viscous, coming off in 

 long strings on the needle. Kosolic acid not changed. On potato the 

 growth is broad and thick of a sordid flesh color. 



70. Bacillus alplia n. sp. 



Occurrence. In the air on West 59th Street. 



Morpholofijj. Large bacilli, .8X1-2//, .singly or in long close straight chains; 



motile. 

 Blolofuj. Gelatin not liquefied at first, but well liquefied in one-hundred days. 



Some colonias on a gelatin plate liquefied in eleven days. Kosolic acid 



not changed ; produces some indol. 



71. Bacillus beta n. sp. 



Occurrence. In the air of the college halhvay. 



ilorphnlof/i). Short, large bacilli with rounded ends, .6X1- 5-2//, actively mo- 

 tile, forms spores. 



Biology. Gelatin liquefied rather slowly, the surface growth on this medium 

 very feathery and thin without definite boundary. Rosolic acid not 

 changed ; forms some indol. 



