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



Nitrate not reduced or not more than very slightly. 

 Chroniogeiiic. 



Motile ; a green fluorescence. 



Rosolic acid decolored 50 



Eosolic acid not changed. 



Growth white 51 



Growth yellow v,.;, 52 



Not motile. 



A crusty skin on l)roth more or less complete. 



Orange red 53 



Pale whitish orange 54 



Slightly crusty, brick red 55 



No crusty skin. 



Salmon pink, pale along puncture 56 



Eeddish pink, Avhite along puncture 57 



Pink, white along puncture 58 



Bright orange 59 



Yellow 60 



Not chromogenic. 



Rosolic acid decolored. 



Culture viscid 61 



Culture soft 62 



Eosolic acid not changed. 



Growth very feathery, especially in gelatin 63 



Growth not feathery, normal. 



Motile ; growth white, rather opaque. 



Eather large bacilli (about .8X1-5 ," ) 64 



Smaller bacilli ( about .5X1 ," ) 65 



Not motile. 



White, rather opaque » . 66 



]\Iisty, concentric, not opaque 67 



Very thin, transparent 68 



34. Bacillus crassiis sputigeiiiis. (Kreibohm). 



Occurrence. From the college collection. 



3IorpltoIo(jij. Short, or moderately long rounded bacilli, .7X1-2/', singly, or 

 more commonly in short chains of two to three elements ; not motile. 



BioJo(jy. As indicated in the synopsis. Milk was not coagulated till twenty- 

 eight days and then only on boiling. 



35. Bacillus viresceiis (Frick). 



a • . 



Oeciirroicc. " Bacillus of green diarrhoea " from the college collection. 



Morpliology. Small rounded Ijacilli, .7X1-2,", singly or in moderately long- 

 straight chains ; actively motile. 



Biology. A partial surface skin is formed on liquid media. In the fermenta- 

 tion tube, abundant growth occurs in the open arm, but it also extends 

 well up into the closed arm. Gro\\ th on agar white, rather translucent, 



