On Certain Bacteria from the Air of New York City. 363 



from the college collection. (4) "Bacillus ramosus non-liqtiefaeieiis " 

 from Krai's laboratoiy. (5) " Bacillus figiiraus " from the college col- 

 lection. 



MorphoJogy. Large straight rod-shaped bacilli .8X1-4/^, but soon Vn-eakiug up 

 into shorter cells in older cultures; singly or in chains; motile. In a 

 twenty -one day culture the bacilli were very short, of the shape of 

 spores but more spherical. 



Biology. Nitrate not reduced or but slightly. The growth on gelatin, both 

 colonies and streak is \exy characteristic, sending off fine ramifying 

 branches far out into the medium. On agar the growth is thin, A\hite, 

 more or less feathery on the edges. Indol is formed. Lactose-litmus 

 quickly made blue. 



Bemnrls. Proteufi zenkeri is probably the same species as B. zopfii. The other 

 cultures before me seem to be wrongly named. 



64. Bacillus lactis cyanogeuus (Hueppe). 

 Occurrence. (1) "Bacillus of blue milk" from the college collection. (2) 



"Bacillus cuniculicida " from Krai's laboratory. 



Morphology. Eounded, thick bacilli, .7-1x1-1-5,", singly or in pairs, actively 

 motile. 



Biology. Nitrate not reduced or but slightly; aerobic, as shown by the growth 

 in the fermentation tube. A slight surface growth on broth. Agar 

 growth translucent white. 



Bemarks. The characteristic blackish color was produced in none of my media, 

 although I made a culture in milk with an acid forming bacillus as rec- 

 ommended. The cells were twice as thick as described by Hueppe, but 

 corresponded with the measurement of Jordan. I was unable to differ- 

 entiate the culture sent to me as "Bacillus cuniculicida" from this 

 species, as neither produced the black color, and they corresponded ^■erv 

 closely otherwise. This culture does not correspond with the description 

 of B. cuniculicida (B. ><epticaemiii' hacmorrJiagicse according to Sternberg), 

 as this is said to be not motile. 



65. Bacillus typhi a1)cIoiiiiiialis (Eberth). 



Occurrence. (1) " Bacillis typhosus " from the college collection. (2) In the 

 air of the college liallway. (3) From a fresh leaf of Sarracenia purpurea 

 at Plattsburgh, N. Y. 



3IorpJiology. Slender rounded bacilli .5-.7'Xl-2.u, singly or in chains ; motile. 

 In No. 3 the cells measure about .5X.7" ouly- 



Biology. Nitrate not reduced or partially so in fifty days. Growth on solid 

 media translucent white. 



Remarks. I do not wish to be understood to imply that the bacilli found bv 

 me in the air and the pitcher plant would produce typlioid fever, or even 

 that they are pathogenic. The presum])tion is that they are not, and I 

 have only included them here because they did not differentiate them- 

 selves on the media used. In this group, the characters are all negative, 

 and we may have to do with closely allied species. I have tried to apply 



