ARTIFICIAL MANURES OR FERTILIZERS. 105 



The guarantees here given mean practically the same 

 in both cases. In No. 1 the percentages represent the 

 amounts in combination with other elements; while in 

 No. 2 percentages of actual constituents are stated, viz., 

 nitrogen, phosphoric acid, and potassium oxide. 



In order to convert the ammonia into its equivalent 

 of nitrogen, the percentage of ammonia may be multiplied 

 by eighty-two per cent, or divided by 1.214 ; since ammo- 

 nia is eighty-two per cent nitrogen, and since one part 

 of nitrogen is equal to 1.214 parts of ammonia. 



Bone phosphate of lime is forty-six per cent actual 

 phosphoric acid; hence multiplying the bone phosphate 

 by forty-six per cent gives the per cent of actual phos- 

 phoric acid. Sulphate of potash is fifty-four per cent, 

 and muriate of potash is sixty-three per cent actual or 

 potassium oxide ; hence, to convert the percentages of 

 these forms into their equivalents of actual, they are 

 multiplied by the factors given. 



In most raw materials another method of guaranteeing 

 is adopted, because in these the guarantee is simply 

 a statement of their purity. For instance, nitrate of 

 soda is guaranteed as ninety-five per cent pure nitrate; 

 muriate of potash is guaranteed eighty per cent pure 

 muriate, etc., which means that the products are respec- 

 tively ninety-five and eighty per cent pure, or in other 

 words, that in the case of nitrate five per cent of it is 

 something other than nitrate of soda, and in the case of 

 the muriate twenty per cent of it is something other 

 than muriate of potash. 



The factors necessary to use in the conversion of the 

 constitu^jits in their usual form of combination into 



