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his lead mines on the Wear and Tyne. The very day before I was there almost every pool in the Dovey contained dead sewen, and a large number were brought to me."
And Mr. Walpole, at page 68, observes;
"The Dovey, naturally one of the most important rivers in the kingdom, 35 miles long, and with a catchment basin of 264 square miles, is being terribly injured by two mines on one of its tributaries (the Twymin). When I was in Merionethshire last August the fish were lying dead in the river, poisoned by pollutions, miles below the point at which the "hush" enters the river."
