120 



MICRO-ORGANISMS IN AVATER 



Bacterial Contents of various Waters as supiolied to London, 

 1885 (Percy Prankland) 



Colonies ohtamed from 1 cc. of water 



lliver Thames 

 Hampton (unfiltered) 

 Chelsea . 



"West Middlesex . 

 Southwark . 

 Grand Junction . 

 Lambeth 



River Lea 



CMngford Mill (unfil- 

 tered) 

 New River 

 East London 



Deep Wells 

 Kent (well at Deptford) 



„ Supply 



Jan. 



Peb. 



23 

 16 



57 

 5 



7 

 39 



41 



10 



7 



246 



2S 



69 



95 

 17 



May 



June 



14 

 3 



24 



3 



30 



22 



SI 

 26 

 47 

 18 



27 



22 



6 



26 



Tlie astonishing effect of sand-filtration, as practised 

 by the London water companies, is here shown for the 

 first time, and we find the first record of the actual re- 

 duction in the number of micro-or onanisms effected in 



At the request of this Local Government Board 

 regular bacteriological examinations were made by 

 one of us ^ of the water supplied to London by the 

 various water companies, and the results of these in- 

 vestigations for the years 1886, 1887 and 1888 are 

 recorded in the following tables, together with the per- 

 centage reduction in the number of micro-organisms 

 effected :— 



' Local Government Board Reports. Eyre and Spottiswoode. 



