ti 



[ 262 ] 



This evil appears to be caufed by the fub- 

 terraneous palTages being funk too deep, by 

 which means the mouth U is too much 

 comnianded by the waters of the Med- 

 lock. 



Having taken this view of the works in 

 Cafile-Jicldy we next took pofleflion of the 

 pleafure boat we had before fpoke for, and 

 peered for TVorJley. The firft objects we 

 met with, were two wears more at Corn^ 

 broke, formed on the fame principles as 

 that in the Cajile-field, fwallowing up ri- 

 vulets in central wells, which convey the 

 water in fubterraneous pafTages under the 

 canal, and permit it to rife again on the 

 other fide, and flow on in its ufual courfe. 



Faffing on, the canal ruqs chiefly along 

 the fides of natural banks ; which courfe 

 was very judicioufly chofe for the conve- 

 nience of poiTeffing not only one bank per- 

 fedtly firm and fecure, but plenty of earth 

 ready for making the other. Juft before 

 we came to Throjlle-nejl Bridge, I obferved 

 a projeding piece of m.afonry in the canal, 

 which, on enquiry, I found to be the cafe 

 of a canal door, for I know not what other 

 name to give it : It is upon the fame prin- 

 ciple as that at the mouth of the fubter- 



ranean 



