27 

 Potash Compounds. 



The two tables following represent those chemicals valued chiefly for their potash. 



Muriate and High-grade Sulfate. 



Brands Substantially Meeting their Guarantees. 



Manufacturer. 



The American Agricultural Chemical Co 



Apothecaries Hall Co. 



Armour Fertilizer Works . 



Beach Soap Co. 



The Berkshire Fertilizer Co. 



Consolidated Rendering Co. 



The Consumers Chemical Corp. 



Eastern States Farmers' Exchange 



A. W. Higgins, Inc. . 



N. J. Fertihzer & Chemical Co. 



Providence Farmers Exchange Inc. 



F. S. Rovster Guano Co. . 



The Wilcox Fertilizer Co. . 



Muriate of Potash. 



Number 



of 

 Samples. 



5 

 1 

 3 

 1 

 1 

 111 

 1 

 2 



41 

 1 



Found. 



49.72 

 52.52 

 50.48 

 50.80 

 52.24 

 51.11 

 51.84 

 51.76 

 52.61 

 52.88 

 49.63 



54.12 



Guaran- 

 teed. 



48.00 

 50.00 

 48.00 

 50.00 

 50.00 

 50.00 

 48.00 

 50.00 

 50.00 

 50.00 

 48.00 



50.50 



High grade Sulfate 

 of Potash. 



Number 



of 

 Samples. 



Found. 



49.64 



50.44 



49.07 

 51.52 



50.24 

 49.79 

 49.00 



49.92 



Guaran- 

 teed. 



48.00 



50.00 



48.00 

 48.00 



48.00 

 48.00 

 48.00 



48.00 



Brands showing a Commercial Shortage of $1 or over per Ton. 



International Agricultural Corp. 



1 Two analyses made. 



2 Sampled at Foxborough. Commercial shortage per ton, .S2.74. Commercial valuation found, $35.66 per ton. 

 Only two 200-pound sacks were sampled, this being the extent of the stock on hand. No other lots were found. 



Double Manure Salts and Kainit. 



' Two analyses made. 2 Three analyses made. 



Potash in the form of sulfate of potash-magnesia usually costs somewhat more per 

 unit than does potash from high-grade sulfate. Assuming that this increased cost is 

 due to the presence of the magnesia salt, more than the usual attention should be paid 

 to the content of this ingredient which the product carries. The average magnesium 

 oxide in the three brands analyzed was 10.28 per cent, and varied from 7.48 per cent 

 to 12.82 per cent. The sample containing the lowest percentage of magnesia was found 

 to contain 19.18 per cent of gypsum or calcium sulfate, which furnishes strong evi- 

 dence that the product was a mixture of high grade sulfate of potash, double manure salt 

 and gypsum. One other sample contained 10.29 per cent of gypsum. The sample 

 containing the highest percentage of magnesia was found to contain only 4.49 per 

 cent of the calcium salt. Although it is not the usual custom to guarantee the mag- 

 nesium oxide in this product, yet for the protection of his customers the importer 

 should insist that the salt be true to name. In the compilation of analyses of fertilizer 

 chemicals issued from the Massachusetts Agricultural Experiment Station in 1919, 

 the average of eighty-two analyses made in the station laboratories previous to that date 

 gives the content of magnesium oxide in sulfate of potash-magnesia as 13.62 per cent. 



The content of chlorine present in the three brands analyzed ran from 1.5 to a little 

 under 2 per cent. 



