On Certain Bacteria from (he Air of Netv York City. 375 



110. Bacillii!>i fiiscus liqiiefacieiis n. sp. 



Occurrence. (1) " Bacilhis fui^cus " from Krai's laboratory. (3) A contam- 

 ination from tlie air of the college laljoratory. 



Blorpliologij. Slender Imcilli. .5-.6Xl-'2,«, singly or in short chains ; not 

 motile. 



Biolofjii. Gelatin liciuetied slowly (in fourteen to fifty days), milk not coagu- 

 lated, nitrate partly reduced. Lactose-litmus made blue, rosolic acid not 

 changed. 



lionnrks. Differs from No. 53 only in that gelatin is iiltimately li(]uefied. 

 This comes near the description of B. ircmclloidcs tSchottelius, but tlie 

 growth is never shining and the licjuefaction is much slower. 



111. liiicillus tlieta n. sp. 



Occurrence. In the air of the college hallway. 



Morj)lttil(i(/i/. Rounded bacilli, .5-. 7X1-1.3,", mostly in pairs ; motileC?) 



Bioloiji/. (ielatin slowly litjuefied (twenty-one days), milk not coagulated ; 

 nitrate completely reduced in twenty-one days; lactose-litmus made lilue. 

 Growth on agar translucent ocherous, o])Scure. On broth, a surface skin 

 gradually foinis which may be made to sink entire. On potato, abund- 

 ant shining brownish ocherous, thick and sjireading. 



EeuKirh's. This seems related to No. 76, but nitrate is reduced and the growth 

 is not just the same. 



11:2. Baciilu!!i kappa n. sp. 



Occurrence. From a sick larva of Scoliopteri/x Jihairix A\ith No. 75. 



Morpholofiij. Little rounded bacilli, singly and in pairs, .7X1/'; iif>t positively 

 motile. 



Biology. Gelatin licjuefied in twenty-eight days ; nitrate completely reduced. 

 Lactose-litmus made blue. Growth Avhite, soft, moderately opaijue, not 

 chromogenic. Forms a surface skin in tlu' open arm of the fermenta- 

 tion tube. 



Gas-formixg Bacilli. 



Synoj)sis of sjiecies. 

 Gelatin ultimately liquefied. 

 Eosolic acid faded. 



Growth not viscous 113 



Growth viscous 114 



Kosolic acid not changed. 



Lactose-litmus reddened, but ultimately becomes blue. 

 Agar growth oj)aque Avhite. 



Not motile 115 



Motile 116 



Agar growth translucent, white, thin, sometimes lobed, spreading. 



Colonies distorted, Proteus-like 117 



Colonies even, noi-mal. 



Not or spasmodically motile 118 



Actively motile 119 



