■500 



DESCRIPTION OF SPECIES. 



5 to 7 /i in length, 2-5 fi in width, 

 singly, in pairs, and zooglcea. 



On agar they produce a bright 

 green film, and cultures are said to 

 emit traces of sulphuretted hydro- 

 gen. 



They were isolated from putrid 

 onions. 



Bacillus alvei (p. 470). 



Bacillus amylozyma (Perdrix). 

 — Rods 2 to 3 ;ti in length and '5 fi 

 in width, in pairs, and in chains. 

 They are anaerobic. 



Colonies white, and producing gas 

 bubbles. 



On potato in an atmosphere of 

 hydrogen the bacilli partly liquefy 

 it, and there is abundant formation 

 ■of gas. 



They ferment sugar and starch. 



Bacillus anaerobicus lique- 

 facieus (Sternberg). — Slender rods, 

 about '6 fi in diam., in pairs, and 

 in filaments. 



Colonies granular and white ; sur- 

 rounded by liquefied gelatine. 



They grow along the track of 

 the needle when inoculated in the 

 <lepth of agar. 



They were isolated from the in- 

 testine in a fatal case of yellow 

 fever. 



Bacillus anthracis (p. 192). 



Bacillus aquatilis (Frankland). 

 — Rods 2'5 n in length, and filaments 

 17 fi or longer. They resemble 

 Bacillus arborescens. 



Colonies after liquefaction of the 

 gelatine have a yellowish-brown 

 nucleus from which proceed twisted 

 strands of filaments. 



Inoculated in the depth of gela- 

 tine the growth in the track of the 

 needle is at first almost invisible, 

 later liquefaction occurs. 



On agar the growth is shining 

 and yellowish. 



Broth becomes turbid, and a 

 sediment forms at the bottom of 

 the tube. 



On potato there is a slightly 

 yellowish streak. 



They occur in water. 

 Bacillus aquatilis fluorescens 

 (Lustig). — Short thin rods with 

 rounded ends. Non-motile. 



Colonies fern-like and iridescent. 



Compare Eisenberg's Bacillus fluo- 

 rescens non-liquefaciens. 



Bacillus aquatilis graveolens 

 (Tataroff). — Slender rods IS /i in 

 length. They rapidly liquefy gela- 

 tine and produce an odour like that 

 of perspiration from the feet. 



They occur in water. 



Bacillus aquatilis sulcatus 

 (Weichselbaum), No. I. — Rods mor- 

 phologically, and in cultures resem- 

 bling Bacillus typhosus. 



Colonies in gelatine exhibit lines 

 and furrows. 



The growth on the surface of 

 gelatine is said to be greater than in 

 cultures of Bacillus typhosus grown 

 for comparison. 



They occur in water. 



No. II. — Rods also resembling in 

 morphology and cultivation the 

 Bacillus typhosus. 



Colonies are said to be thicker than 

 those of No. I., and not dentated. 



The growth on potatoes is yel- 

 lowish-brown, and emits a faint 

 odour of urine. 



They occur in water. 



No. III. — Very short rods. 



Colonies show lines and furrows, 

 ancj are yellowish. 



On the surface of gelatine the 

 growijh develops as a thin whitish 

 film. 



On agar the growth is white and 

 abundant. 



On potato the growth is yellow. 



They were isolated from water. 



No. IV. — Rods and filaments. 



Colonies circular and bluish. 



On the surface of gelatine the 

 growth is greyish-white, and on 

 agar there is a similar appearance. 



They do not grow on potato. 



They occur in water. 



No. V. — Rods rather thicker than 

 those of Bacillus typhosus. 



Colonies similar to those of No. I. 



The growth on the surface of 

 gelatine is yellow. 



On agar the growth is viscid and 

 yellow, and on potato the growth is 

 faintly yellow and the surrounding 

 medium stained bluish-grey. 



They occur in water. 



Bacillus arborescens (Frank- 

 land). — Rods 2'6 n in length, and 



