19 



PHOSPHORIC ACID COMPOUNDS. 



Five samples of dissolved bone black were examined and 

 Dissolved no deficiencies were found. The average available phos- 

 Bone Black, phoric acid found in this material was 15.97 per cent. 



The average calculated commercial valuation has been 

 $15.20 per ton. 



Nineteen analyses of acid phosphate were made, 

 Acid Phosphate, representing thirty-three samples. In all cases the 

 guarantee of available phosphoric acid has been 

 maintained. The average retail cash price has been $14.63, and the 

 average calculated value has been $14.33 per ton. The average 

 available phosphoric acid found in acid phosphate was 16.04 per cent. 

 The pound of available phosphoric acid has cost 4.56 cents. 



Seventeen analyses of Thomas basic slag phosphate 

 Basic Slag have been made, representing twenty-seven sam- 



Phosphate. pies. Four tests showed the available phosphoric 



acid below the guarantee. The average retail cash 

 price paid for basic slag was $15.88, and the average calculated com- 

 mercial valuation $12.96 per ton. Slag has tested on the average 

 15.09 per cent available phosphoric acid. The pound of available 

 phosphoric acid has averaged 5.26 cents. The following brands showed 

 a commercial shortage of over 50 cents per ton. 



Sanderson Fertilizer & Chemical Co., No 174. Total phosphoric 

 acid found 16.20%, guaranteed 17%; available phosphoric acid found 

 14.14%c, guaranteed 15%. 



Whitman & Pratt Rendering Co., No. 954. Total phosphoric 

 acid found 12.88%, guaranteed 17%; available phosphoric acid 

 found 12.12%,, guaranteed 13%. 



MIXED COMPLETE FERTILIZERS. 



In making a study of the mixed complete fertilizers, it seems 

 convenient, for the sake of comparison, to divide them into three 

 grades: — high, medium and low. Those brands having a calculated 

 commercial valuation of $24.00 or over per ton have been designated 

 as high grade, between $18.00 and $24.00 per ton, medium grade, and 

 below $18.00 per ton, low grade. The following table shows a compar- 

 ison of the three grades of fertilizer in relation to retail cash price, 

 calculated commercial value and money difference between cash 

 price and commercial value. 



