121 



the Art by which this is effected 





River 



I will suppose that a h rge 



has always passed through the valley, arid, like 



large rivers, that it 



many 





not 



finally navigable, but I hat 



art it has been made so to a certain spot, and that near tl 



th 



e 



ouse 



built 



? 



is I M >t 



nder such circumstances a bridge would 



naturally be placed where rocks present a foundation, and to th 

 bridge, and no further, we may imagine the water navigable 



s 



ti 



The bed of the river bein 



dug so deep 



its to bring all 



the water below the bridge to the same level, the house would 

 stand high above the water, instead of appearing on 



the 



level 



as it does at present.* .The shape of the water should be 

 made gradually to swell into the broad river; but as there will 



th 



en 



be 



a disproportion between the channel near ihe bridge 

 and the broadest part of the river, this might be accounted for 

 by a channel dug near the group of elms, and thus the house 

 would seem to stand on a broad promontory, formed by the 

 conflux of two different streams. 



a 



The water above the bridge will not require to be dug 

 any deeper, nor the surface to be much lowered; because the fall 

 at the bridge will fully account for the river being no further 

 navigable, than where a ledge of rocks impedes its course; for 

 the largest rivers in the world are interrupted by reefs, called 



rapids; and therefore, not only at the bridge, but at the junc- 



# This in 1814 was completed, and the effect produced exceeds the promise, or any 

 representation made by the drawings. From the ground near the house there was a 

 fall of only five feet to the surface of the water ; that surface has been lowered thir- 

 teen feet, 



R 



