WEEDS OF AGRICULTURE. 301 



"How to destroy black grass ?"—" How to destroy colt's- 

 foot?" &c. ; as if there were any secret known to a few, or 

 any charm in existence, by which an overwhelming increase 

 of any particular weed could be stopped at once. But the 

 world is always in a state of pupilage ; some are learning 

 what others know ; and the queries which to the young are 

 interesting, are to the experienced and wise trifling and 

 superfluous. So it must be with essays on agricultural 

 subjects, which can only be directed to the general instruc- 

 tion of the inexperienced ; while the practised and sagacious 

 agriculturist must be i-equested to pardon the particularity 

 with which things well known to him are so tediously written 

 down. 



