ERRATA. 



Page 155, line 23, for "found" read "formed" 



179, 

 190, 

 203, 

 207, 

 347, 

 347, 



3, .. " Canal" read " Cannel" 

 25, after "casts" insert "of" 

 23, for "^0. 4" read " No. I" 

 II, .. "No. 1" read "No. i" 



7, .. "subtlety" read "subtilty" 

 14, .. "takes" read "take" 



