On Certain Bacteria from the Air of New York City. 311 



90. Bacillus aiitliracis (Pollender). 

 Occiirroicr. From the college collection. 

 3fo.-pJio/n(/i/. Large square emled liacilli, .8-lX--5/^, singly or in chains, the 



elements often seijarated by spaces; not (or spasmodically ?) motile ; 



forms large spores. 

 Biolofj//. Gelatin qnickly liquefied, milk rapidly coagulated, the coagulum 



slowly dissolved, nitrate completely reduced in two days ; rosolic acid 



not changed ; lactose-litmus not reddened. 



91. Bacillus crystalloides n. sp. 



Occurrence. A contamination on some plates of B. lacHa eri/fhro<jcncs. 



JInrph()/()(ji/ and ])iology. As in No. 90, but the growth on agar is at first rathei 

 clear, refracting, checkered-crystalline ; the edges ^vith shallow lobes.* 

 Later it becomes thicker and opaque, coarsely granular, a little wrinkly, 

 but on the thinner edges the crystalline markings persist. 



92. Bacillus l-aiuosus (Frankland). 



Occurrence. ( 1 ) From Kriil's laboratory. (2) " Bacillus anthracoides " from 

 KnU's lalioratory. (3) In the air on West 59th Street near the college. 

 (4) With No. 91. 



3Iorpholo(i!i and liiology. As in Nos. 90-91, l)ut the growth on agar is smooth , 

 finely granular and somewhat translucent, well defined and granular at 

 the margin or a little feathery, scarcely at all creased. 



93. Bacillus lactis albus (Loffler). 



Occurrence. (1) Found by Dr. Kitchellin a mouse dead of anthrax. (2) In 

 the air of the college hallway. (3) With No. 91. 



Blorphnlwjn and biology. As in Nos. 90-92. The cells are not motile or spas- 

 modically so. In the media a yellow color may be produced of gi-eater 

 or less intensity, but the growth is not colored. Tlie agar growth is as in 

 No. 92, l)ut usually wrinkled, forming elevated, sharp folds. 



Bemarks. Liifiler has described some species of tlie anthrax group, and I apply 

 his name to this form. The slower rate of liquefaction which he men- 

 tioned may be due to a difference in the composition of the media. 



94. Bacillus niycoides (Fliigge). 

 Occurrence. From the college collection. 



MorpholofD) and Ijiology. As in Nos. 90-93, but the growth on agar is extra- 

 ordinarily feathery and marked with concave creases. 

 Kemtirks. Nos. 90-94 may be but races of one species. 



95. Bacillus nieseiitericiis vulgatus (Fliigge). 

 Occurrence. (1) From the college collection. (2) From the air in the college 



hallway. ( 3) A contamination in a culture of B. heholus. 

 Mdrjiholofju. Large, rather square-ended bacilli, .7-1X1-3/-', singly or in long 



chains, not or spasmodical]}' motile, form spores. 



*L)r. Chctsman hasobtaiued this identical growth from tjulUnc^ot .Bacillus anlhracix. 



