American Fisheries Society. 147 
in Colorado where the trout has obtained such a foothold since 
the artificial propagation has been taken up there, we face the 
evil results of irrigation. The stock of blue back salmon has 
disappeared from the Columbia river, a fact which is largely due 
to irrigation in the head waters. Dr. Evermann can vouch for 
that. 
Dr. Evermann: I think that is true, although I have made 
no personal observation on that point; I have been told by people 
in various places in the Snake River Basin, that the young blue- 
back salmon go down during the spring floods, and in immense 
numbers run up into the irrigating ditches ; and I know the same 
thing to be true in certain places in Colorado as to trout; but as 
to the fact regarding the blueback salmon, I am not personally 
conversant with them, though I have no doubt that irrigating 
ditches in the west are a very serious factor in the destruction of 
the various Salmonidae in that region. 
President: It seems to me that the importance of this sub- 
ject requires especial attention. Perhaps the committee on reso- 
lutions have not time to take this thing up and present it in shape 
to be effective. It seems.to me that there should be a special 
committee to look into that matter and draw strong resolutions. 
If the committee on resolutions have the time and can get the 
testimony they want and incorporate it, that is all right; but I 
have heard no motion to take the matter up and refer to the com- 
mittee on resolutions. 
