i8 



I-:. -HELFORD. 



li conditions the Meep p<>rtion> mi-rate hack into the moraine, 

 /. e., up stream, until the source- is reached. The proce>s of 

 lowering the water level at the- mouth of a stream and tin- develop- 

 ment of the steep portion i> known as rejuvenation. Rejuvena- 

 tion usually affects the distribution of ti>he> in stream-. 



However, streams which are made up of intermittent pools 

 and riffles are not so much at'fected as larger streams. Further- 

 more, softness of the glacial clay in which the north shore streams 

 are located would cause the changes in the stream bed to take 



TAHLK II. 

 Tin-: DisTRiuriitiN <! FISH IN HICKORY CREEK (AND ITS WEST BRANCH) IN THE 



SIMMER OF IQOg. 



Those starred were in the pool nearest the source. I., The first mile of the stream, 



mi-. i :n tin tUh pool nearest the source, toward the mouth; II., the third and 



fourth miles; III., at the head of erosion, five miles from the pool nearest the source; 

 IV., six miles from the pool nearest the source; V, nine miles from same; stream 

 much larger with K""d riffles and one weedy cove. 



