170 AGRICULTURAL EXPERIMENT STATION. [Jan. 



n. — Analysis of Commercial Fertilizers and Manur- 

 lAL Substances sent on for Examination. 



Wood Ashes. 

 [ I. Sent on from Ipsvdch, Mass. II. and III. Sent on from Concord, Mass ] 



Sample I. contains but one-half the amount of potash of 

 an ordinary quality of Canada wood ash. Samples II. and 

 III. are of a good quality, and correspond fairly with the 

 guaranty of the dealer. The question has been repeatedly 

 asked, on what basis to adjust differences between a stated 

 guaranty of composition and the actual results of an analysis 

 of a sample of wood ash. Our answer has been, in these 

 cases, to allow 5^ cents for every pound of potassium oxide 

 and 6 cents for every pound of phosphoric acid which the 

 analysis shows to be less than the guaranty states to be 

 present. 



