1889.] PUBLIC DOCUMENT — No. 4. 563 



food at a reasonable cost, and that it contains them in such 

 form and in such proportions as will best meet existing 

 circumstances and special wants. In some instances it may- 

 be mainly either phosphoric acid or nitrogen or potash ; in 

 others, two of them ; and in others again, all three. 



A remunerative use of commercial fertilizers can only be 

 secured by attending carefully to the previously stated con- 

 siderations. 



The new duties assigned to the director of the Station 

 render it necessary to discriminate in the future, in official 

 publications of the results of analyses of commercial fertili- 

 zers and of manurial substances in general, between analyses 

 of samples collected by a duly qualified delegate of the 

 Experiment Station, in conformity with the rules prescribed 

 by the new laws, and those analyses which are made of 

 samples sent on for that purpose by outside parties. In 

 regard to the former alone can the director assume the re- 

 sponsibility of a carefully prepared sample, and of the 

 identity of the article in question. 



More detailed information in this connection, regarding 

 the duties of the director of the Massachusetts State 

 Agricultural Experiment Station, and the obligations of 

 the manufacturers, dealers and agents engaged in the sale 

 of commercial fertilizers or materials used for nianurial 

 purposes, may be obtained by addressing the director at 

 Amherst, Mass. Copies of the above-printed Act may be 

 had on application. 



