135 



'* level fields, where marsh lands grow up 

 " in the room of the corn." 



Page 53, " The benefit of these expe- 

 «* riments depends so much upon the good 

 " management and patient perseverance 

 " of those who undertake them, that I do 

 *' not wonder irrigation has so often proved 

 ** unsuccessful. It is very necessary for 

 ** the operator to have just ideas of levels, 

 ^* hues, and angles; a knowledge of super- 

 " licial forms will not be sufficient. Ac- 

 " curate notions of solid geometry are 

 " absolutely necessary." 



Whether this is self-commendation or 

 not, whether it is the trick of the trade or 

 not, I do not say ; but I must say, that it 

 is placing an imaginary obstacle in the 

 way of a practice which is valuable and 

 easily effected. Where there is plenty of 



s goo<J 



