No. 6. 



DEPARTMENT OF AGRICULTURE. 



815 



acid contained in this material. As compared with tankage, the 

 general tendency is to assign a higher commercial rating to the 

 phosphoric acid in bone and to the nitrogen a rating not very dif- 

 ferent from that given in tankage. The quotations of Thos. J. 

 White & Co., show an average wholesale rate in Baltimore during 

 September, 1904, to March, 1005, for crushed tankage to have been 

 2.575 per unit of ammonia and $0.10 per unit of bone phosphate of 

 lime. This is equivalent to $3.13 per unit of nitrogen and $0,218 per 

 unit of phosphoric acid. The average composition of the ground 

 bone and bone meal samples analyzed last fall in Pennsylvania was: 

 Phosphoric acid. 23.62 per cent.; nitrogen, 2.95 per cent. The pre- 

 pared bone contains less fat and moisture and often less nitrogen 

 than the ordinary "rough bone," but these differences tend, in a man- 

 ner, to neutralize each other. 



Assuming for the rough bone quoted in the New York market the 

 same composition as the bone meal sold in Pennsylvania and for the 

 value of the nitrogen $3.13 per unit, the values per pound of the sev- 

 eral constituents would be: 



Wholesale Cost per Pound of Fertilizer Constituents, New York. 



II. Bone. 



Grade. 



•o 



3 



> 



■*-> 



c 

 w 



3 



C 



o 

 O 



Rough bone, 

 Ground bone, 



[Nitrogen 



1 Phosphoric acid, 



[Nitrogen, 



[Phosphoric acid, 



0) 



c 



Xi 



15.65 

 1.49 



22.11 

 2.10 



3 



a 



u 



a 



0) -m 



■3? 



o >- 



" a 



P 



18. 7S 

 1.79 



26.41 

 2.62 



Valuation in Neighboring States. 



It is desirable, from all points of view, that the schedule of val- 

 uation throughout a district in which similar market conditions pre- 

 vail, should differ as little as possible. It has been our practice in 

 the past, to conform our schedule to that adopted after very careful 

 co-operative study of market conditions for each year, by the New 

 England States and New Jersey, except where the peculiar condi- 

 tions of our markets have made the valuations diverge too largely 

 from the actual selling prices, as in the case of ground bone and 

 dissolved rock phosphates. The schedules for these States for 1904 

 and 1905 are as follows: 



