370 On Certain Bacteria from the Air of Neio York: City. 



85. Bacillus Fisclieri ( Beyerinck. ) 



Occurrence. ( 1 ) " Photobacteriniii pliosi)]ioresceii.s " from Krai's laboratory. 

 (2) " Photolmcteriuiii balticum '' from Krai's laboratory. (3.) "Pho- 

 tobacterium liscberi " from Krai's laboratory. (4) " Pliotobacterium 

 Pfliigeri " from Krai's laboratory. 



Morjiholoi/i/. Short bacilli .5-.6X.6-1.2/^, nsrially singly. 



Bi()I(t(/i/. OJelatin liciiietied slowly, usually in twenty-eight days. Milk co- 

 agulated but very slowly and often not demonstrable in twenty-eight 

 days ; in No. ( 4 ) in one hundred and seventy days ; nitrate slightly I'e- 

 duced but very slowly. Growth on solid media is yellow, but it takes 

 place slowly and the cultures are liable to die. Rosolic acid and lacose- 

 litnius are unchanged. 



Iicmnrks. Ajiparently differs from B. an/ciileo jihoHjihoirKCots liquefncienH Katz 

 only in liciuefying geletin much more slowly. 



' 86. Bacillus proteus vuls;a!'is ( Hauser. ) 

 Occurrence. " Proteus vulgaris " from the college collection. 

 Morphnlnqii. Large rounded bacilli, .8X1-'^/') singly and in long cliains, the 



elements separated l)y spaces ; spasmodiciilly motile. 

 Bioloffij. In lactose-litmus gelatin little wandering colonies may ))e seen in tlie 



unliquefied part of the medium ; growth on agar soft, white ; scarcely 



a well defined surface growth on broth. Gelatin, quickly li(j[uefied, 



milk coagidated, nitrate not reduced. 



87. Bacillus alvei ( Cheshire & Cheyne. j 

 Occurrence. From the college collection. 

 3IorpJt()logy. Slender straight bacilli .7X3.5//, in short chains, motile, forms 



spores. 

 Biolofjy Gelatin quickly liquefied, milk coagulated, nitrate slightly reduced. 



Growth on agar very thin, spreading. Rosolic acid not changed. 



88. Bacillus uiegateriuui (De Bary). 



Occurrence From the college collection. 



Morphology. Slender liacilli, .8X2-5//, when about to produce spores the cells 



are more rounded and about 1-1.2X4//, singly and in chains, not motile. 

 Biology. Milk was not coagulated in the first sample, but quickly in second 



one, nitrate not reduced. A wrinkled surface skin on broth. 



89. Bacillus subtilis (Ehrenberg). 

 Occurrence. From the college collection. 

 Morphology. Large square ended bacilli, .7X2-3//, singly or in long chains ; 



spasmodically motile, from spores ^vhich are wider than the rods. 

 Biology. As in No. 88, but the growth has a more crusty texture. The siinie 



contradictory effect was produced in milk as in No. 88, but this may be 



due to differences in the samples of milk -which were the same for these 



two species. 



