100 MICRO-OEGANISMS 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 

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

 water supplied to London by the Kent Company. 



The microbial condition of the rivers lire and Ouse 

 above York has been investigated by one of us,^ with 

 the following results : — 



Bacterial Cow^position of the Bivers Ure and Ouse above York 

 (Percy Frankland) 



Number of -Colonies. 

 Description obtain^ from 



^ 1 c.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 

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

 the Nidd. j 



33,400 



31,200 



The river Dee, from which Aberdeen obtains its 

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

 bacteriologically examined by one of us,^ 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 



^ * Recent Bacteriological Research in connection with Water Supply,*" 

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



2 Beport to the Corporation of Aberdeen, Percy Frankland, 1892. 



