376 On Gertaiyi Bacteria from the. Air of New York City. 



La<*tose-litnuis made blue at first 120 



Gelatin not liquefied. 



Lactose-litmus permaniently reddened. 



Growth fluid ; cells in capsule 121 



Growth not fluid. 



Nitrate partly reduced 122 



Niti'ate completely reduced 123 



Lactose-litmias reddened, later blue. 

 Eosolic acid not changed. 



Culture not viscous 124 



Growth very viscous 125 



Rosolic acid faded 126 



113. Bac'illU!ii rosaceiis iiietalloides (Dowdeswell). 



Occurrence. (1) "Bacillus miniaceus " from Krals laboratory. (2) "Red 

 water from Brooklyn," from the college collection. (3) "Bacillus ma- 

 genta," from the college collection. (4) "Bacillus ruber of Kiel " from 

 Krai's laljoratory. 



MorpholcKjij. Small rounded bacilli, .5-.7X-8-1.3//, singly, in pairs or short 

 chains, motile, or partially so, often not motile. In old cultures, small 

 spherical cells occur, gradually to the exclusion of the bacillar forms. 



Biology. Gelatin liquefied, but not quickly; in fourteen days it is usually 

 distinct, but may not ensue for thirty days. Milk is coagulated more 

 or less rapidly, in all eases liy twenty-one days, on boiling. Nitrate 

 strongly reduced, usually completely. Lactose-litmus reddened. Gas 

 is formed in the fermentation tube, and in cultures on lactose-litmus 

 gelatin. A surface crust on broth. Rosolic acid decolorized. Growth 

 on all media strongly chromogenic, fine crimson red, but a white form 

 readily occurs on repeated cultivation. 



114. Bacillus Plymoutlieui^is. 



Occurrence. ' ' B. rubrum, Plymouth, ' ' from the college collection. 

 ^lorphology and biology. As above, except that the growth is viscous. 

 Remarks. This form is scarcely deserving of specific rank. 



115. Bacillus oxytocus perniciosus (Fliigge). 



Occurrence. "Oxytocus perniciosus, " from the college collection. 

 Morphology. Short, thick, rounded bacilli, lXl-2-2«, singly or in jiairs; not 



motile. 

 Biology. Gelatin liquefied, but not before thirty-five days; milk coagulated; 



nitrate well rediaced; lactose-litmus reddened. 

 Remarks. Described as not liquefying gelatin, l)ut the liquefaction occurs .so 



late that it may have been overlooked. 



116. Bacillus Kralii n. sp. 



Occurrence. "Bacillus butyricus" from Krai's laboratory. 

 3Iorphology. Short rounded Bacilli, .7X-8(", mostly singly, motile, l)ut not 

 actively so. 



