378 On Certain Bacteria from the Air of Neiv York City. 



121. Bacillus Priiddeni n. sp. 



Occurrence. Foitnd by Dr. rnidden in a ease of Cystitis, the cells surrounded 

 by a capsule. 



MorjihoJof/y. Rather large short bacilli, .9-1X1-2 //, UNually singly ; not motile. 



Biology. As in B. coll communh, with the exception that the gi'owth has a soft 

 consistency, so that an oblique culture on lactose-litmus gelatin it How s 

 down to the base of the tube, but produces no liquefaction. 



RemarTcs. This may be one of the many varieties of the following species, but I 

 have not found a good description Avhich covered the differential character 

 Avhich I have observed. The capsules did not a])pear so as to be noticed 

 in preparations from an agar culture. Apparently' this species is much 

 like the "Pneumococcus" of Friedlander. 



122. Bacillus coli coiniuuiiis (Escherich). 

 Occurrence. (1) From the college collection. (2) " Bacillus neapolitanus'' 



from Krai's laboratory. (3) " Bacillus cavicida " from Krai's laboratory. 



(4) "Bacillus der Frettchenseuche" from Krai's laboratory. (5) " Bacillus 



acidi lactici " from the college collection. (6) " Proteus hominis "' from 



the college collection. 

 Morpholofin. Short bacilli ; some constricted, .6X-8-1.2/^, usually singly, not 



motile. 

 Biology. Milk coagulated, nitrate only partially reduced in twent.\- -eight days ; 



rosolic acid not changed ; growth not viscid. 



123. Bacillus Bookeri. 



Occurrence. Found by Dr. Prudden in a case of Cystitis. 

 Morpliology. Very short bacilli, resemlding cocci, .8X1 /', partially motile. 

 Biology. Differs from the jireceding in reducing niti'ate completely. 

 Remarks. This may be the Bacillus f. of Booker which seems to be an un- 

 usually vigorous variety of B. coli communis. 



124. Bacillus acidiforiuaus (Sternberg). 



Occurrence. From the college collection. 



3Iorphology. Very short bacilli, resembling cocci, .GX-*?-!/', not motile. 



Biology. ^lilk coagulated, nitrate ])artially reduced, rosolic acid not changed. 

 Lactose-litmus is at first reddened, but in twenty-fi^•e days a blue spot 

 appears which gradually spreads throughout the medium (ninety days). 



125. Bacillus capsulatus (Pfeffer). 



Occurrence. (1) From the college collection. (2) "Bacillus synxanthus" 



from Krai's laboratory. 

 Morphology. Bacilli varying considerably in size, .5-lX-~-l-5 ", singly or in 



short chains ; not motile ; no capsule seen. 

 Biology. Milk coagulated, nitrate completely reduced. The growth on agar 



is very viscid. 

 Remarks. Apparently 5. synranthus Schn'lteris the same as^. capsnlatux Pfeffer. 



At any rate, I have been unable to differentiate these two cultures. 



Keithei showed the capsule fioiii agar cultures. 



