42 
TABLE VI(c)—(conid.) 















THAMES. | LEE; NEw RIVER. | 
1908-9 
Month, | Raw. | Filtered.| Raw. | Filtered. Raw | Filtered. 
% Oe de Oe % Sa 
October bi 78°2 43°8 86°7 47°O 819 | 61°9 
November + | 76°1 28°5 83°7 | 16°6 81°4 | 60°8 
December ah 83°7 50°7 80°3 | 66°6 73°72 52°38 
January, 1909 .. | 86°6 68°6 85°7 50°O 756 | 60°0 
February Wat Re Fe is 50°8 86°6 20°0 63°9 | 13-7 
< “Ct out ors) 
March one | 83°7 60°1 92°6 64°7 79°6 | 29°4 
1909-10, | | 
Averages, 1908-9 Ca one 42°8 | 83°9 | 39°2 75'8 | 43° 
April, 1909 | 85°4 28°3 92737 | Nil 82.3 | ae 
May on V2r/3 14°O 82°3 28°5 81°6 | 375 
(2 out of 7) 
June .. | 851 | 220 | 82rs Nil. | 61-3 | 4or0 
July a | S225 2007 2°71 22-5, 81°5 | 29:6 
August see nase 25°6 | 67-0 | 14°7 96) eee 
September 7 | 74°O 17°8 74°6 Nil. | O45 | 172 
October APA We alec! Oe" | LANE | 79°3 | 44°4 74°1 | 32°2 
November ere | 88-0 46°8 | 85°3 | 3373 69°8 | 44°9 
December fistint = eG ae! | 82°6 27°5 ea 65°2 
January, 1910 .. | 87°6 54°2 | 9g0°6 81°8 82°5 | 35°L 
February iY | Rew 59°4 | 94°0 | Goo. | 8475 “> Sanam 
March a | 86°2 42°8 | 76:2 Nil, | 62°0 | 20°8 
Averages, 1909-10] 82°3 42°6 | +822 28°2 43'9 | 378 



It seems hardly necessary to cite further evidence, but one 
other instance may be mentioned. The work of Houston shows 
that exactly the same state of affairs exists, toa less extent, 
in England. The tables taken from his reports, 1909, Ig10 and 
