538 



DESCRIPTION OF SPECIES. 



duced 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 together. The for- 

 mation of ellipsoidal spores occurs 

 in the usual way ;. they measure 

 2*5 to 2*8 p long, and more than 



1 p. wide. The bacillus is found 

 in rotting eggs, and can be culti- 

 vated on boiled white of egg. 



Bacillus ulna (Vignal). Rods 



2 p. 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 bottom 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 1*5 to 5 p. 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, liquefaction 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 conjunctive 

 (Gombert). Rods 2 to 8 p in length, 

 1 p, 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 hyperaemia 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 



