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once to the hatchery and try the effect of electrozone 

 on the fish. It may Interfere seriously with their breath- 

 ing, but nothing besides a trial will determine. In case 

 they can endure the addition of the disinfectant, the 

 next step will be to devise a practical method for 

 the regular and gradual addition of the disinfectant to 

 the running water. If this method of treatment be 

 adopted It will have to be carried on until the fungus 

 spores have nearly all been carried out of the creek. 

 It Is not expected of course entirel}' to rid the creek 

 water of the fungus. At most it will be possible only 

 to kill off the superabundance of spores. 



Very truly yours, 



Charlks Wright Dodge. 



DISCUSSION ON THE PAPER OF MR. 

 CHARLES WRIGHT DODGE. 



Mr. Amsden spoke of the matter that had come 

 up recently as to an epidemic among the trout 

 In Spring Creek, which furnishes the water for the 

 State ponds. It Is a mile long and furnishes the water 

 for the Hatcheries at Caledonia. This is a remarkable 

 stream, as it has a temperature all the year round of 45 

 to 50 degrees, and abounds with lake trout, and of late 

 years the German trout have been put in from the 

 Hatcheries, and evervthlnsf has crone alone for years 

 without any trouble except about eight years ago. At 

 the head of this stream is a pond of about ten acres, 

 which furnishes the power for a grist and saw mill. 

 When the water gets low it has been the habit for years 

 to store the water during the night, and the next day 

 the bottom of the pond in some places is exposed. 

 About eight years ago the owners of the mill took a 

 notion they would kill the weeds in the bottom of the 



