132 MICRO-ORGANISMS IN WATER 



No. of Colonies 



from 1 c.c. 



of water 



Large storage reservoir ; the greater part of its con- 

 tents had been stored for six months, and none 



less than one month (leeward side) . . . 464 



Ditto (windward side) 368 



Old East Filter Bed 1,178 



Old Middle 1,627 



Old West 1,413 



New East 1,776 



Filtered Water 



General Filter Well ....... 95 



80 



80 



Average = 85 



Grand Junction Waterworks, Hampton, August 13, 1892 

 Filtered Water 



n f -p.,. No. of Colonies 



FilterBea Bldsmdays from 1 c.c. 



aa)S of water 



Old East .... 35 ... 25 



Old Middle .... 22 ... 19 



Old West .... 17 ... 17 



New West .... 12 ... 23 



General Filter Well . ... 23 



Unfiltered Water 



Old East Bed ... ... 1,008 



Old Middle Bed ... ... 1,029 



Old West . ... 1,222 



New West . ... 288 



On June 25 the examination of the water on the 

 several filterbeds, four in number, showed that this con-, 

 tained about the same number of bacteria as that in the 

 small storage reservoir from which the niters were being 

 supplied, and rather less than that in the Thames water 

 at the intake itself. Unfortunately samples of the 

 filtered water as it issues from the individual beds 

 could not on this occasion be obtained, but only from 

 the well in which the filtered water from the several 

 beds collects. This filter well is, however, in imme- 

 diate communication with a small service reservoir, 

 so that the water in it is not necessarily wholly coming 

 from the filters directly, but may be more or less 



