160 



The use which I wish to make of this digression is, to 



ex- 



plain the manner of passing the valley by artificial means, 

 where the road does not require a common bridge, but rather 



a 



duct, to ornament the 



am or mound of earth thrown 



the valley; and as this must necessarily 



some ob 



struction to the water, I think it might be made subservient to 



other object in view, that of raising the water to a higher 



th 



level 





instead of digging a deeper channel 



a continued surface of water in appear 

 levels may be very different. 



9 



; thus producing 

 though in fact the 



.T*P* 



"*" ****« *" * ■»<>■ fr ./ T.,„,„. 





