78 BACTERIOLOGICAL EXAMINATION OF WATER. 



slowly liquefied as a long narrow funnel. Fliigge does not 

 mention any liquefaction. On agar it produces a thick Chinese 

 white growth (Frankland). 



GROUP XI. 



This group comprises the Sarcinae found in water supplies. 

 The most common variety appears to be the Sarcina aurantiaca 

 which produces small round yellow colonies in gelatine-plates ; 

 later the colonies appear granular and acquire an orange-gold 

 colour ; the gelatine is slowly liquefied. The same orange-gold 

 growth is seen on agar and potato. The Sarcina alba closely 

 resembles the above, but its cultures have a white colour. The 

 Sarcina lutea is very common in air and has been found by Tils 

 in water ; the cocci of which it is composed are larger than those 

 of Sarcina aurantiaca, and its cultures have a yellow instead of 

 an orange-gold colour. The cocci in all the Sarcinae are arranged 

 in twos or fours and in packets, which occupy three dimensions 

 in space. 



GROUP XII. 



This group includes the various Spirilla which have been found 

 in water. The Vibrio aquatilis of Gimther, the Vibrio Finkler 

 Prior, Vibrio Metchnikovi, and the Spirilla isolated from water 

 by Sanarelli, which strongly resemble the Spirillum Cholerae 

 Asiaticae, will be found fully described under the diagnosis of the 

 Spirillum Cholerae from allied organisms. 



The following Spirilla have also been found in water from 

 various sources. 



Vibrio Aureus. 



Isolated by Weibel. The Spirillum is 1^ times as thick as 

 Koch's Comma spirillum ; it produces long and short forms, but 

 the tendency to produce spirals is not marked ; it readily under- 

 goes degeneration, is not motile, and does not stain with Gram. 

 The colonies on the surface of gelatine plates are circular, flat 

 expansions of a yellow colour. Under a low power they are 

 smooth-rimmed, circular, granular, and golden-yellow in colour ; 

 the gelatine is not liquefied. On gelatine-stab there is a bowl- 

 shaped yellow-ochre growth 'on the surface, and a yellow-ochre 



