29 



Bacillus figurans, from water ; bacilli varying in length, sometimes 

 very short, at other times in long threads, the superficial growth 

 on gelatine plates forms a fine interlacing network. 



Bacillus mesentericus fuscus, from air, soil, etc. ; a very common 

 organism; slender short bacilli in pairs or fours, with small 

 refracting spores, situated irregularly. 



Vibrio rugula, from faeces and dental tartar ; rods 6 to 8 /t in length ; 

 spores are developed at one extremity, causing club-shaped 

 enlargement. 



Proteus vulgaris,* a very common organism in putrefying animal 

 matter ; the baoiUus varies in length from 1 to 3 /i, is actively 

 motile, with a terminal flageUum ; the growth on gelatine is 

 typical: depressions filled with Mquid gelatine and white 

 masses of bacilh, with branches spreading out over the gelatine ; 

 is pathogenic for rabbits and guinea-pigs. 



Proteus mirabilis,* resembles the above, but does not liquefy the 

 gelatine so quickly ; the involution forms are more varied. 



* These, witli Proteus Zenkeri, were fonnerly included under the name 

 Bacterium termo. 



