152 ON THE EXAMINATION OF WATER PROM THE SYDNEY SUPPLY. 



These data yield, for 1 ccm. of the water in question within the 

 above period, an average number of 165 colonies, 76 of which 

 ( = 46 p.c.) caused liquefaction of the nutritive gelatine. 



Especially prominent or, so far as known, pathogenic microbes 

 did not come under notice, nor so far could experiments be 

 made in order to ascertain which, if any, of the cultivated bacteria 

 belong to the group of the so-called "water-bacteria," distinguished 

 from others by their power of multiplying in water in which no 

 traces of organic matter can chemically be found. 



From the above it may be seen that the average number of 

 bacterial colonies, namely 165, for the period stated, is by far 

 lower than that obtained previously (cf these Proceedings, 2nd 

 series. Vol. I. 1886, pp. 913, 1205), and this is the more interest- 

 ing as the temperatures of the water for that period were, of 

 course, considerably higher than those noticed on former 

 occasions (I.e.). 



