w 



It is a curious fact, which I believe has not been no- 

 ticed by any author, that if two streams derived from the 

 same source, and ultimately coming to the same point, 

 be rendered of different velocities by the intervention of 

 natural bars, such as banks, rocks, &c. or by artificial ones, 

 especially by mills, of which die, action is not constant, 

 many fish, on being removed from one to the other, will 

 die 1 I had often heard persons speaking to this effect ; 

 but did not think there was so much foundation for the 

 assertion, until experience convinced me fully of the 

 fact. 



I have seen a very recent instance, of some jacks being 

 taken from one branch of a stream, and put into another 

 branch of it, forming a very fine water above a grist-mill. ' 

 They all died ; but this year seventeen jacks were brought 

 from a similar situation, viz. a good water above a mill, 

 and they are ;f!l alive and thriving ! 



The water from which the first jacks were taken, is 

 t:eloiv a mill, but has nothing iu it peculiar, nor is there, 

 in any part of either of the waters alluded to, the smallest 

 demonstration of peculiarity in the soil, nor of any thing 

 which could be reasonably supposed to affect them, either 

 arising from the exercise of any trades, or from manu- 

 factures, prejudicial to health. In fact, there are no 

 mills, except grist-mills, nor any thing but meadows 

 and corn-fields, near the streams first described. 



Thus much I have said in support of my hypothesis, 

 that " baits should always be taken from strong rapid 

 waters, as such will play best," 



