to a slight extent in these rivers, so that the theory of 

 transportation is superfluous. 



Again, the facts are not favourable to the supposition that 

 either pollution or overcrowding has much to do with the 

 matter. The Clerk of the Kent, Bela, Winster, Leven, and 

 Duddon district reports this year that, in the River Duddon, 

 there is no obstruction between the sea and its source, and 

 that it is perfectly free from pollution. The river is to a great 

 extent unpreserved, and there has been no overcrowding. 

 The disease was not noticed till last year, 1 88 1-2, when the 

 watchers removed about forty fish. The Leven is an outlet 

 of Lake Windermere. The only possible source of pollution 

 is the sewage of the little town of Bowness, which falls into 

 the great body of water of the lake, and maybe disregarded. 

 Disease was unknown in the Leven until the last season, 

 when it suddenly became the most infected river of the 

 district. 



A very competent authority, Mr. Berrington, Chairman 

 of the Usk Board, informs me that the disease has always 

 been known to occur occasionally, especially in late kelts 

 rarely in fresh-run fish ; sometimes in dace, trout, and 

 young salmon. In 1881, however, it was carefully looked 

 for, but no trace of it could be found. Nevertheless, in 

 January and February, 1882, it was unusually prevalent 

 in spawning salmon. In the end of March and in April, 

 when the river contains the smallest number of salmon, 

 a violent epidemic broke out among the trout, and lasted 

 through May and June. 



The salmon ran up the river early this year ; and, in 

 April, numerous diseased clean fish were observed. Between 

 the first week of July and the end of October, the disease 

 entirely disappeared ; but, in November, a violent outbreak 

 occurred, trout and salmon, spawned and unspawned, 



