On Certain Bacteria from the Air of New York City. 3T7 



Biolngij. Gelatin liquefied in about thirty days ; milk coagulated, nitrate well 



I'educed Init not completely. 

 Remarls. This cannot be B. hidyrius Pragmowski which is anaerobic. It 



differs from B. hufijricufi of Hueppe in the size of the cells, the rate of 



liquefaction of gelatin and in other details. It apparently differs from B. 



(/asofoniiaiis Eisenberg in liquefying gelatin much more slowly. 



117. Ilacillii!>( larvicida n. sp. 



Occurrence. In the exudate from the anus of a sick larva of Clhiocampn frafiilis. 



Slovphologij. Short rounded l)acilli .SXl/', singly, and actively motile. 



Biologi/. Gelatin liquefied in fourteen to twenty-one days ; milk coagulated ; 

 nitrate completely reduced. Colonies on gelatin present curious twisted 

 shapes like those described for the species of ' 'Proteus. ' ' 



118. Bacillus lactis aerogeiies (Escherich). 



Ovenrrence. From the college collection. 



Mi»pJtolo(/i/. Small rounded bacilli, .6X1/", singly or in pairs; occasionally 

 motile. 



Biolof/y. Gelatin liquefied in fifty days or not ; milk coagnlated, nitrate partly 

 reduced. One culture upon lactose-litmus gelatin produced liquefaction 

 in fifty days and the reddening that first took place was succeeded by 

 blue ; a second culture produced only reddening and no liquefaction. 



Eemavl:><. The second culture on lactose-litmus was not to be distingiiished 

 from B. coli comnntnis. B. lactis acrogenes is said not to liquefy gelatin 

 and be not motile, but these characters were not very markedly contra- 

 dicted by the present culture, so I have prefen-ed not to change the name. 



119. Bacillus Ternicosus (Zimmermann). 



Occurrence. (1) From Krai's laboratory. (2) In the air of the college hall- 

 way. 



3IorphoJogy. Small bacilli, .5X-6-1/", singly and in short chains, actively 

 motile. 



Biology. Gelatin slowly liquefied, in from ten to thirty days, milk coagulated, 

 nitrate not reduced or but very slightly. 



Remarks. The cultures obtained by me from the air does not correspond 

 exactly v,-\i\\ the culture of B. vernicosnis ; the gTowth has an ocherous 

 tinge and seems otherwise slightly different. I cannot positivel\- differ- 

 entiate it, however. 



120. Bacillus pyogenes foetidus llquefacieus u. sp? 



Occurrence. From Krai's laboratory. 



Morphology. Small bacilli, .6X1/", singly or in pairs ; not motile. 



Biology. Gelatin quickly liquefied, milk coagidated, nitrate not reduced. 



Colonies regular, uncharacteristic. IJosolie acid not decolorized. 

 Remarks. I have seen no description of this species. 



