WATER 



Collection and transmission of samples. 



One of the drawbacks of the bacteriological examination 

 of water is the great care which is required in the collection 

 of the samples ; even apparently trivial errors or omissions 

 may entirely vitiate the result. Very precise and seemingly 

 trifling directions must be given, unless the sample is collected 

 by an expert. 



For the ordinary examination 2-ounce (57 c.c.) glass-stoppered 

 bottles are sufficient. 



Fig. 4. Collecting Bottle and Tin, 



Sometimes it is advantageous to examine greater quantities 

 of the water and collecting bottles of larger size must be used. 

 It is rarely necessary to examine more than rooc.c., and this 

 can be most conveniently done by using two of the small 

 bottles for collecting the sample. 



If the specimen cannot be examined at once, and delay is 

 unavoidable, the sample should be packed in ice, and then 



