100 MICRO-ORGANISMS IN WATER 



through the service pipes, contained on an average 

 forty-four. 



This increase in the number of micro-organisms in 

 service-pipes will be referred to later on in connection 

 with experiments made by one of us, on the deep-well 

 water supplied to London by the Kent Company. 



The microbial condition of the rivers Ure and Ouse 

 above York has been investigated by one of us, 1 witli 

 the following results : 



Bacterial Composition of. the Rivers Ure and Ouse above York 

 (Percy Frankland) 



Number of Colonies 



obtained from 

 Description le.c. of water 



Taken from the river Ure, above Ripon, twenty-seven miles ^ 

 above intake of the York waterworks. The river Ure 

 rises on the western extremity of the North Riding of - 1,800 

 Yorkshire, passing on its way only small towns and vil- 

 lages. 



Collected about sixteen miles above intake of the York water-' 

 works, and about three miles below Boro'bridge, and ten 

 miles below Ripon, both discharging some sewage into the 

 Ure. 



Collected from the river Ouse opposite the intake of the York"! 



waterworks. Between the points of collection of No. 2 I o- QAA 

 and this sample there is no town and only one small river, [ 

 the Nidd. ) 



The river Dee, from which Aberdeen obtains its 

 water-supply, has been quite recently (July, 1892) 

 bacteriologically examined by one of us, 2 with the 

 following results : 



Above Braemar the Dee was found to yield only 

 eighty-eight micro-organisms in 1 c.c., and is, therefore, 

 bacteriologically of great purity, The next sample was 

 taken from the river below Old Mar Castle, and after 

 thorough incorporation of the tributary Cluny (which 



1 ' Recent Bacteriological Research in connection with Water Supply/ 

 Jour. Soc. Chem. Ind., 1887, Percy Frankland. 



- Eeport to the Corporation of Aberdeen, Percy Frankland, 1892. 



