- 24 - 



Sinoe this is true, it is likely, when the final results 



of the experiment are availahle, that it will he shown 



that the Influence of surface rxui off in contributing 



to floods, may he avoided and the stream kept free from 



silt, by maintaining a narrow strip of forest along the 



banks. 



Such a strip will serve another important function in 



moderating the fluctuation in the temperature of the stream 



water by the influence of the shade provided by the forest 



and the decreased air temperature therein. Embody (19) 



has shown that the eastern brook trout cannot long survive 



a temperature of much over 81.5° P., and that the brown and 



steelhead trout are killed by a temperature of 85.5" F. 

 All trout undoubtedly prefer the lower temperature provided 



by cool spring-fed streams. High temperatures caused by 



exposure, have ruined the trout fishing in many of our streams 



which might still be productive if a border Of trees had been 



leftif or might again become productive if such vegetation 



were now allowed to develop. 



In view of these facts it is j'ustif iable, and to serve 



the most advantageous use it is necessary, to extend the 



protection forest, as such, in narrow strips bordering streams 



and lakes. This extension would also serve the needs of 



recreationists, as suggested above, by improving the fishing, 



and by providing contigaous areas for this use. 



To provide for the complete and most intensive recreation- 

 al use of the public forests, tho in this case for purely 



