No. 5. 



DEPARTMENT OF AGRICULTURE. 



447 



acid, the sum of the lowest figures given by him for soluble and re- 

 verted phosphoric acid is used. The law of 1879 allowed the maker 

 to express his guaranty for nitrogen either in terms of that element 

 or in terms of the ammonia equivalent thereto; since ammonia is 

 composed of three parts of hydrogen and fourteen parts of nitrogen, 

 it is a very simple matter to calculate the amount of one, when the 

 amount of the other is given ; the amount of nitrogen multiplied by 

 1.214 will give the corresponding amount of ammonia, and the amount 

 of ammonia multiplied by 0.824 will give the corresponding amount 

 of nitrogen. In these tables, the expression is in terms of nitrogen. 

 The law of 1901 and 1909 abolished the alternative and required 

 that the quantity shall be given in terms of nitrogen. 



Many manufacturers after complying with the terms of the law, 

 insert additional items in their guaranties, often with the result of 

 misleading or confusing the buyer ; the latter will do well to give heed 

 to tbose items only that are given as the law requires and that are 

 presented in these tables: 



A summary of the analyses made this season may be presented as 

 follows : 



Summary of Analyses Made this Season. (Spring 1914). 



Number of analysps. 

 Moisture, per cent.. 



Phosphoric acid: 



Total, per •■ent 



Available, per cent., 

 Insoluble, per cent., 



Potash, per cent. , 



Nitrogen: 



Total, per cent., 



Available, per cent 



Available, per cent., 



Inactive insoluble, per cent.. 



Mechanical anal.vses of bone: 



Fine, per cent 



Coarse, per cent 



Commercial valuation,* 



Selling price,* 



•a 

 a 



3 



o 

 u 



O 



23 

 5.11 



21.34 



3.08 

 3.06 



49.00 

 51.00 



$,'?0.15 

 31.43 



•Dollars per ton. 



"For the purpose of indicating more specifically to the eye, cases 

 deficient in guarantee, an asterisk has been affixed in the analytical 

 tables where the ingredient has been found less in quantity than the 

 manufacturer guaranteed. Too great emphasis should not be placed 

 upon very slight deficiencies, because very slight imperfections in 

 mixing and slight variation in analysis are practically unavoidable. 

 The asterisk has been used, therefore, only in cases where the de- 

 ficiencies amount to 0.2 per cent, or more, except where nitrogen has 

 been guaranteed in amounts not higher than 1.0 per cent, in which 

 case an asterisk has been affixed where the deficiency amounts to 0.1 

 per cent, or more." 



29 



