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streams too low to be diverted by dams ; 

 but I have been deterred from attempt- 

 ing to give much encouragement to the 

 idea, from the apprehension, that the 

 quantity of water, that might be raised 

 thereby, would not correspond with the 

 magnitude of the expense. I shall, how- 

 ever, venture to recite a few instances of 

 what has been done in this way : — A 

 steam-engine, at St. Astle, we are told, 

 raises sixty-three gallons at every stroke, 

 fourteen times in a minute. The very 

 ingenious Dr. Cartwright informed me, 

 that he had erected a steam-engine for his 

 brother, for the purpose of irrigation 

 only, which, if my recollection be cor- 

 rect, raised nearly the same quantity as 

 the above engine and that he had erected 

 another, near Brentford, of greater power. 

 The expense of the former of these two 

 was one hundred pounds. The steam- 

 engine, 



