12 



(d) Castor Pomace. 



B. Phosphoric Acid Compounds analyzed. 



This table shows the composition of those products which are valued chiefly for their 

 phosphoric acid. The percentage of available and of total phosphoric acid only is pub- 

 lished. The difference between the total and available phosphoric acid found is the in- 

 soluble phosphoric acid in each ease. All the brands substantially met their guarantee. 



Manufacturer. 



Brand. 



Num- 

 ber of 

 Sam- 

 ples. 



The American Agricultural Chem- 

 ical Co. 



Armour Fertilizer Works 



Beach Soap Co 



The Berkshire Fertilizer Co. . 



Bowker Fertilizer Co. 



The E. D. Chittenden Co. . 



The Coe-Mortimer Co. . 



Eastern States Farmers' Exchange . 



The L. T. Frisbie Co. . 



Thos. Hersom & Co. . . 



A. W. Higgins, Inc. 



International Agricultural Corp., 

 Buffalo Fertilizer Works 



International Products Corp. . 



Listers Agricultural Chemical Works 

 Lowell Fertilizer Co. 

 National Fertilizer Co. . 

 Nitrate Agencies Co. 

 Piedmont-Mt. Airy Guano Co. 

 The Providence Farmers Exchange, 



Inc. 



Ross Bros. Co. .... 



F. S. Royster Guano Co. 

 Sanderson Fertilizer & Chemical Co. 

 Springfield Rendering Co. 

 C. P. Washburn Estate . 

 Whitman & Pratt Rendering Co. . 

 The Wilcox Fertilizer Co. 



Witherbee, Sherman & Co. 

 Worcester Rendering Co. 



16% Plain Superphosphate . 

 High Grade Acid Phosphate 

 Armour's Big Crop Acid Phosphate 

 Acid Phosphate, 1920 Stock 

 Acid Phosphate .... 

 Acid Phosphate .... 

 Bowker's 16% Acid Phosphate 



Acid Phos 



E. Frank Coe's 16% Superphosphate 

 Eastern States 16% Acid Phosphate 

 Frisbie 's Acid Phosphate 

 Acid Phosphate .... 

 Old Deerfield Acid Phosphate 

 Old Deerfield Precipitated Bone 



Buffalo Sixteen Percent 



Acid Phosphate .... 



Precipitated Bone 



Listers High Grade Acid Phosphate 



Lowell Acid Phosphate, 16% 



National 16% Plain Superphosphate 



NACO Brand Acid Phosphate . 



Piedmont 16% Acid Phosphate . 



Exchange Brand Acid Phosphate, 16% 

 Ross Bros. Co. Acid Phosphate 

 Royster's 16% Acid Phosphate 

 Sanderson's Acid Phosphate 

 Acid Phosphate . 

 Acid Phosphate . 

 Acid Phosphate . 

 Acid Phosphate . 

 Ground Phosphate Rock 

 Phosphate Rock and Sulphide of Ba- 

 rium (Barium-Phosphate) 

 Acid Phosphate 16% . 



Total 

 Phos- 

 phoric 

 Acid. 



17.07 

 17.14 

 17.73 

 18.80 

 17.60 

 18.85 

 17.73 

 16.89 

 16.84 

 18.04 

 15.97 

 17.42 

 18.04 

 38.09 



17.76 

 17.37 

 28.37 

 17.07 

 17.20 

 17.07 

 17.11. 

 18.34 



17.30 

 17.32 

 17.22 

 18.16 

 17.81 

 17.07 

 18.52 

 18.11 

 31.46 



28.22 

 17.93 



Available 



Phosphoric 



Acid. 



Found. 



Guar- 

 anteed. 



16.13 

 16.40 

 16.71 

 17.98 

 17.37 

 17.68 

 16.76 

 16.07 

 15.64 

 17.02 

 15.43 

 16.09 

 17.69 

 36.15 



16.20 

 17.09 

 26.84 

 16.00 

 16.49 

 15.87 

 16.91 

 17.22 



16.38 

 16.33 

 16.89 

 17.27 

 17.57 

 16.56 

 17.93 

 18.03 



17.73 



16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 30.00 



16.00 

 16.00 



16.00 

 16.00 

 16.00 

 16.00 

 16.00 



16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 

 16.00 



16.00 



1 The product was found to contain .63 per cent nitrogen, which would indicate that it was run through the 

 mills before the material which had previously been ground was thoroughly cleaned from the chutes and buckets. 



2 Two analyses made. 



