538 



DESCRIPTION OF SPECIES. 



duoed by this bacillus in a nourish- 

 ing liquid. Cloudy masses are 

 found on the surface of the liquid, 

 which later form a thick dry 

 pellicle, consisting of bundles of 

 threads matted togetjier. The for- 

 mation of ellipsoidal spores occurs 

 in the usual way ; they measure 

 2-5 to 28 ft long, and more than 



1 n wide. The bacillus is found 

 in rotting eggs, and can be culti- 

 vated on boiled white of egg. 



Bacillus ulna (Vignal). — Rods 



2 fi in length ; singly, and in pairs, 

 and in short chains. 



Colonies composed of concentric 

 zones varying in granularity. 



Inoculated in the depth of gela- 

 tine, liquefaction occurs rapidly in 

 the track of the needle ; later, there 

 is a deposit at the bottoin of the 

 liquefied area and a pellicle on the 

 surface. 



On agar- they form a white ad- 

 herent layer, and the jelly is tinged 

 with brown. 



In broth a pellicle forms on the 

 surface. 



On potato they form a pellicle 

 with characteristic linear markings. 



They liquefy serum. Cultures 

 produce a putrefactive odour. 



They occur in human saliva. 



Bacillus vacuolosis (Sternberg). 

 — Rods lo to 5 ft in length, 1 /x in 

 width, containing vacuolated proto- 

 plasm; filaments, and involution 

 forms. At times slowly motile. 



Inoculated in the depth of gela- 

 tine, hquefaction occurs slowly at 

 the upper part of the track of 

 the needle, forming a cup-shaped 

 cavity ; the liquefied gelatine is 

 viscid, and a cream-white layer 

 forms on the surface. 



In agar the development in the 

 track of the needle is scanty ; on 

 the surface a cream-white layer is 

 formed, and the bacilli are united 

 in long jointed filaments. 



On potato a similar growth is 

 produced. 



They were isolated from the in- 

 testine in fatal cases of yellow fever. 



Bacillus varicosus conjunctivae 

 (Gombert). — Rods 2 to 8 ju m length, 

 1 /x in width. 



Inoculated in the depth of gela- 

 tine they produce a greyish-white 

 filament in the track of the needle, 

 and a greyish-white patch on the 

 surface ; liquefaction follows with- 

 out turbidity. 



On the surface of agar a white, 

 dry, adherent film is formed. 



On potato the growth is, at first,, 

 white and dry, later, reddish-brown. 



They produce hypersemia when 

 injected into the conjunctiva. 



They were isolated from the 

 healthy human conjunctiva. 



Bacillus venenosus (Vaughan). 

 — Motile rods. 



Colonies circular, whitish. 



Inoculated in the depth of gela- 

 tine there is growth in the track of 

 the needle and on the free surface. 



On agar they form a white film, 

 and on potato a moist brownish 

 layer. 



They are pathogenic in small 

 animals. 



They occur in water. 



Bacillus venenosus brevis 

 (Vaughan). — Rods short and thick. 



Colonies are yellow and composed 

 of concentric rings. 



Inoculated in the depth of gela- 

 tine they grow in the track of the 

 needle and over the free surface. 



On agar they produce a white 

 film. 



On potato the growth is brownish. 



They are pathogenic in small 

 animals. 



They occur in water. 



Bacillus venenosus invisibilis. 

 — Slender rods. 



Colonies irregular, granular. 



Inoculated in the depth of gela- 

 tine the growth is extremely slow 

 both in the track of the needle and 

 on the surface. , 



On agar there is a whitish film, 

 and on potatoes a brownish layer. 



They are pathogenic in small 

 animals. 



They occur in water. 



Bacillus venenosus lique- 

 faciens (Vaughan). — Rods. 



Colonies circular, granular, yel- 

 lowish. 



Inoculated in the depth of gela- 

 tine they grow in the track of 



