LEADING PRINCIPLES. 163 



slight excess of phosphoric acid tends to hasten the 

 maturity of any crop. For this reason it is always 

 prudent to apply some superphosphate to crops re- 

 quiring a long season, such as tomatoes, melons, 

 corn, etc. 



As the fifth and last principle, I will state that 

 barnyard manure, although perhaps just what is 

 wanted otherwise, may be objectionable for certain 

 crops, such as strawberries, onions, etc., on account 

 of the weed seed it contains. If very foul, it should 

 not be used for these crops. 



'TJUIVBRS177; 



THE END. 



