BY OSCAR KATZ, PH.D., M.A. 923 



handsomely ramified threads or fibres which stretch over the whole 

 available surface of the agar-agar on either side. Besides this 

 superficial growth, there is also some growth in the interior of the 

 agar-agar, inasmuch as short, cloudy masses penetrate from the 

 surface into the substance of the solid agar-agar. 



In concluding this first part of my Notes on Water from the 

 Sydney Supply from a bacteriological point of view, I wish to 

 state once more that they relate exclusively to the pipe- water of 

 a single locality, of a locality where its quality might, of course, 

 be altogether different from that at other places in or about the 

 city. The number of bacteria in a given sample of water bears, 

 under otherwise the same circumstances, as has been already 

 mentioned above, a direct relation to the amount of organic 

 matter in it, and this organic matter will or may not be equally 

 distributed throughout the whole supply. Therefore it certainly 

 would be erroneous to apply what could have been stated about 

 the condition of the water of that locality to the whole supply in 

 general. Further, the above statements as to the quantity of 

 bacterial colonies in the sample under consideration are the results 

 of cultivation experiments made during a comparatively cool and 

 dry season. How the results will turn out during the hot summer 

 or in wet periods in winter, cannot yet be exactly anticipated. 

 Of special importance, of course, it would be in these bacterio- 

 logical examinations by means of the gelatine-plate-process, always 

 to have a watchful eye on whether the bacillus of typhoid fever, 

 this social calamity, might with absolute certainty be found in the 

 Sydney water, or not. 



