XIV. 



J. M. SMAIL. 



exceptions, Glasgow and Manchester. The watersheds 

 which form the source of supply to these cities being prac- 

 tically waste and under the absolute control of the City 

 Councils, pollution of supply is reduced to nil and sedimen- 

 tation and screening being considered sufficient protection 

 to Public Health. 



The following table shews the character of the filter beds 

 employed by the water companies for filtering the water 

 taken from the rivers Thames and Lea :— 



Chelsea. East London. 





Ft. 



In. 





Ft.In. 



Thames sand 



... 4 



G 



Sand ... 



... 2 



Shells etc. ... 



... 



3 



Hoggin 



... 6 



Gravel 



• ... 3 



3 



Coarse gravel 



... 1 



Total 



8 



Total 



3 6 



Grand Junction — 1st. 



Harwich Sand 

 Hoggin 

 Free gravel... 

 Coarse graved 

 Boulders 



Total ... 



Lambeth. 

 Thames sand 



Shells etc 



Coarse gravel 



Total ... 



2 G 



6 



9 



9 



1 



5 6 



3 

 1 

 3 







Southwark and Vauxhall. 

 Harwich sand ... 3 

 Hoggin ... ... 1 



Fine gravel... ... 9 



Coarse gravel ... 9 



Total 



2nd — New Pattern. 



Sand 2 



Gravel 6 



Drains 3 



Total 



2 9 



New River. 



Sand 2 3 



Gravel increasing in 

 coarseness towards 

 bottom 3 4 



5 



7 



1 

 1 



9 

 



West Middlesex. 



Harwich sand 



Barnes sand 



Gravel screened to 

 different sizes and 

 arranged in layers 1 



Total 3 9 



