157 



>■ iik 



map and in the drawings, would also contribute to improi 

 shape of this pool; while the plantations suggested, on the head 



would hide the low ground beyond il: for although water in 

 nature is really on high ground, yel in appearance it fills the 

 lowest place, because we seldom see ground below the water, 

 either the descent is so gradual, or the obstruction >o bold, as 



to conceal the different levels, and deceive the sight. 



OF BRIDGES AND VIA-DUCTS. 



There are two obvious uses for a Bridge, the first is to pa- 



r, the second to pass under; the first is always necessary, 



the other only occasionally so, or where the water under the 

 bridge is navigable; yet self-evident as this fact may appear, 

 we often observe bridges raised so high, as to make the passage 



over them difficult, when there is no passage under them re- 



quired; and this is the case with the present lofty bridge at 



Woburn. The construction of bridges has been so often and so 



ably discussed, that it is dangerous to attempt any thing new 

 on the subject; yet I think such a form adapted to the purposes 

 of passing over, as may unite Strength with Grace, and Use 

 with Beauty, is still a desideratum in architecture. The consi- 

 deration of this subject has led me to insert the following short 



digression, which will not, I hope, be deemed wholly irrele- 



vant. 



Architecture has been classed under two different heads, 

 Grecian, and Gothic; the first depends on perpendicular pres- 



