ELISHA MITCHELL SCIENTIFIC SOCIETY. 6i 



The value of these products can not be stated exactly, but 

 will be very nearly given by the following figures: 



Value of fertilizers produced in North Carolina in 1886. 



12,402 tons Guano - 1^23.00 1^285,246 



10,000 tons Acid Phosphate 14.00 140,000 



1,400 tons Ground Rock 9.00 12,600 



23,802 " Fertilizers valued at - ^437,846 



It must, however be noted here that some of the companies 

 buy acid Phosphate of North Carolina make, mix it with 

 cotton-seed meal or other ammoniate and sell it as Guano. It 

 is difficult to say exactly how much acid phosphate is thus 

 counted twice, first as acid phosphate, the company selling 

 it as such, and then by the purchaser as Guano after it has 

 been dry mixed with some ammoniate. But there is reason 

 for believing that this would not exceed 1,500 tons of the 

 acid phosphate, corresponding to about 2,500 tons guano. 

 A fair allowance would be 1,500 tons to be subtracted from 

 the guano out-put. The preceding table would then stand 

 corrected as follows : 



12,402 tons Guano less 1,500 tons — 



10,902 tons Guano at - $23.00 ;^250,746 



10,000 tons Acid Phosphate at 14.00 140,000 



1,400 tons Ground Rock at 9.00 12,000 



22,000 tons fertilizers valued at ;^403,346 



The 1,400 tons Ground Rock is not counted twice as it is 

 North Carolina Phosphate Rock, Phosphate Conglomerate, 

 etc., raised in the State, and sold as "fine ground " without 

 being acidulated or ammoniated. 



By reference to the table of production it will be seen that 

 two companies make a speciality of " fine ground " Rock, 

 French Bros at Rocky Point, Pender county, and the North 

 Carolina Phosphate Company at Raleigh. 



French Bros, have been in the business for several years, 

 mining and grinding their own rock from contiguous de- 

 posits. The rock is a phosphatic conglomerate, a mass of 

 phosphatic pebbles and nodules in a cement of carbonate of 

 lime. It is burnt in kilns, screened, and the residue ground. 

 This residue may contain : 



Phosphate of Lime - - 20.34 per cent. 

 Lime, as oxide and hydrate 37.52 per cent. 



