ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 197 



method, grows well, reduces nitrates to nitrites. Its affinities are with 

 B. Fairmontensis Wright, B. aquatilis communis, and B. No. 46 Conn. 



Baclerium-aerofaciens sp. n. — An oval organism 0-4 x • 8-1 fi. It 

 is motile, does not stain by Gram's method, grows well, forms gas, 

 reduces nitrates. It is nearly allied to the hog-cholera group, but most 

 closely to B. sinuosum. 



Bacterium minutum sp. n. — A cocco-bacterium 0*4 x 0' 5-0*7 fx. Is 

 actively motile, does not stain by Gram's method, grows well, forms 

 gas, reduces nitrates. On potato the growth is yellow, the medium 

 becoming bluish. 



Bacterium croceum sp. n. — An actively motile rodlet with rounded 

 ends, measuring 0*5 X 3 /a, and occurring singly, in pairs, chains, and 

 threads. It is stained by Gram's method. Its optimum temperature 

 is 22° C, but it grows well at 37°. It grows well on agar and gelatin, 

 and on bouillon, but not on potato. The growth on agar is deep yellow. 



Bacterium palaeformans sp. n.— A rodlet with rounded ends, measures 

 0-5 x 2 fx, or less, occurs singly, in chains and threads, is actively 

 motile, and is stained by Gram's method. A yellow pigment is formed 

 on gelatin and agar. Gelatin is liquefied. This microbe appears to 

 be a motile form of B. dormitator Wright, though it is closely allied 

 to B. croceum. 



Bacterium subflavum teres sp. n. — The cells are oval and actively 

 motile ; they measure • 6 x 1 * 5 ll. They do not stain by Gram's method. 

 The growth is yellowish or buff-coloured. 



Bacterium arborescens amethystinum subsp. n. — A thin rodlet with 

 rounded ends. It measures 0-2-0-3 x 1-5-2-3 ll. It is not motile, 

 and is not stained by Gram's method. It grows best at from 22° to 30°. 

 This organism appears to be a subspecies of Bac. arborescens Frank- 

 land, from which it differs in the appearance and colour on agar stroke. 



Bacillus stellatus sp. n. — A rodlet with rounded ends 2-3 ll long 

 X 0*8-1 ll broad. It is non-motile and stains by Gram's method. It 

 forms oval central spores, quickly on potato, but slowly on agar. It 

 appears to be an ally of Bac. verticillatus Rav. 



Bacterial Flora of New Mexico.* — J. Weinzirl has made a study 

 of the bacterial flora of the semi-desert region of New Mexico, paying 

 special attention to the bacteria of the air. The chief results of the 

 investigation were that the flora, while somewhat limited, was widely 

 distributed. The number of air-borne bacteria, though not small, is 

 less than in fertile and cultivated regions. 



Many of the species, mostly micrococci, were chromogenic. The 

 flora is characterised by its inertness towards saccharated media, and 

 its failure to peptonise gelatin. The characters of ten species are 

 given in detail. In the course of the investigation it was found that 

 jB. acidi lactici and B. lactis acidi were invariably present in the samples 

 of milk examined. B. mesentericus vuhjatus was regularly obtained 

 from native grown potatoes. All attempts to discover B. tetani and B. 

 subtilis failed. 



Bacteriology of Ozaena.f — Dr. W. Stein detected Bacillus mucosus 

 in 44 out of 51 cases of atrophic rhinitis, and holds that it is in the 



* Journ. Cincinnati Soc. Nat. Hist., xix. (1900) pp. 211-42 (4 tigs.). 

 t Centralbl. Bukt., xxviii. (1900) pp. 726-36, 769-78. 



