262 BACTERIOLOGICAL EXAMINATION OF WATER. 



Cholera Vibrios and the Bacilli of Green Pus. The bacilli 

 overgrew the vibrios ; at the end of three months the vibrios 

 disappeared, but the bacilli could still be found after thirteen 

 months. Cholera vibrios planted out in a filtered broth of 

 B. pyocyaneus were quite unable to develop and rapidly dis- 

 appeared. 



Cholera Vibrios and Briegei'^s Bacilli. The bacilli were at 

 first overgrown by the vibrios ; later, they developed well. At 

 the end of three months both were found alive in a mixed 

 culture. 



Cholera Vibrios and Emmerich's Naples Bacillus. The relation 

 was the same as in the case of Brieger's bacilli. 



Cholera Vibrios and Staphylococcus Pyogenes Aureus. The 

 staphylococcus was at first overgrown by the vibrios, but both 

 were found alive at the end of three months. The same result 

 was obtained with Staphylococcus pyogenes albus. 



Cholera Vibrios and Streptococcus (Erysipelas). The strepto- 

 cocci had no action on the vibrios, but were rapidly destroyed. 



NON-PATHOGENIC ORGANISMS. 



Cholera Vibrios and B. Prodigiosus. On mixed plates the B. 

 prodigiosus grew so rapidly that the cholera vibrios could not 

 be observed ; so the mixed cultures were planted out on 

 potatoes and incubated at 22 C. and 37 C. At 37 C. the 

 cholera colonies were seen, at 22 C. the red growth of prodi- 

 giosus appeared. On agar plates at 37 C. the cholera vibrios 

 could be detected after two months. The B. prodigiosus was 

 found alive after thirteen months. 



Cholera Vibrios and B. Indicus. The B. indicus overgrew the 

 vibrios ; both disappeared in three months. 



Chulera Vibrios and B. Fluorescens. The fluorescent bacteria 

 had no influence on the vibrios and died out before the latter in 

 mixed cultures. 



Cholera Vibrios and B. Violaceus. The B. violaceus was over- 

 grown by the vibrios and disappeared in fourteen days. 



Cholera Vibrios and B. Subtilis. The B. subtil is grew with the 

 cholera vibrios without any unfavourable influence. The same 

 result was obtained with the B. mycoides, B. mesentericus, 

 Proteus species, and B. butyricus (Hueppe). 



