Organisms of Sanitary Significance on Grains 221 



date the bacteriological examination of waters, for the eastern states 

 at least, except in the immediate neighborhood of grist-mills, etc.; 

 but they certainly render it imperative that great care should always 

 be used in the interpretation of results. Certainly the old and fast 

 rule concerning the significance of the presence of any "intestinal 

 forms" as prima facie evidence of sewage pollution must be most 

 discriminately applied. 



Whether our results will involve any change in the criteria now 

 in vogue in judging of the character of a water can only be a matter 

 of conjecture until work on the waters of grain-producing regions 

 has been carefully conducted. It seems obvious that at least inspec- 

 tion of watersheds by the trained bacteriologist is necessary, and 

 that no adverse opinion should be based upon the results of a single 

 bacteriological examination without eliminating this possible source 

 of entrance of bacteria of supposedly suspicious character. 



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