THE BRIGHTON FERTILIZER. 359 



bones. For instance, in No. 2,2.79 per cent, of the phosphoric 

 acid present are equal in value to the reduced phosphoric 

 acid of our commercial superphosphates. 



Sample No. 1 I have not tested in that direction. Allow- 

 ing for it a similar amount of phosphate, soluble in citrate of 

 ammonia (2.82 per cent.), as in No. 2, we find, although 

 there is a decided difference in the chemical composition of 

 these two samples of "Animal Dust," that they are acci- 

 dentally of a corresponding commercial value. The larger 

 percentage of phosphoric acid in No. 1 compensates for the 

 smaller percentage of nitrogen it contains, as compared with 

 No. 2 above. 



A valuation of the constituents of the " Animal Dust," 

 according to the basis adopted in commercial transactions 

 ($57.35) proves, that the amount of phosphoric acid and of 

 nitrogen which a ton of it contains, costs the farmer from $7 

 to $8 less than in most artificial fertilizers sold. 



The abstraction of fat, and the boiling and drying by steam, 

 leaves bones, meat and blood, if properly ground, in a very 

 favorable state for disintegration. Animal dust, like fish 

 guano, may serve to some extent as a good substitute for 

 Peruvian guano. It must, however, be considered a special 

 fertilizer on account of the entire absence of potassa. This 

 circumstance has been taken into consideration on the part of 

 the manao:ers of the Brig-hton works. 



To meet the requirements of farmers engaged in general 

 mixed farming, a second fertilizer is manufoctured at the 

 abattoir, which contains several per cent, of potassa, by mix- 

 ing the animal dust with potash compounds. This potassa- 

 containino- fertilizer is sold as " Standard Animal Fertilizer." 

 An analysis of it gave the following results : — 



Moisture lost at 100° C, 13.70 



Volatile and organic matter, ..... 56.00 



Ash constituents, . . . . . . . 30.30 



Nitrogen in animal matter, . . . . .5.90 



Phosphoric acid (soluble in citrate of ammonia), . 4.36 



Phosphoric acid (insoluble in " " )» • 3.43 



Potassium oxide, . . . . . . .2.25 



