APPENDIX I 



337 



Bone meal 



Steamed bone flour 



Dissolved bones 



Mixtures and com- 

 pound manures 



Basic slag (Thomas 

 phosphate powder) 



Genuine bone meal contains from 48 per cent, 

 to 55 per cent, phosphates, and from 3| per 

 cent, to 4^ per cent, nitrogen. If phosphates 

 are low nitrogen will be high, and conversely. 

 If bone meal is so finely ground that 90 per 

 cent, or over passes a sieve of ^-inch mesh, 

 an addition of 2s. Qd. per ton should be made 

 to the valuation. 



, Ground to flour, and containing about 60 to 65 

 per cent, phosphates and about 1 to 1^ per 

 cent, nitrogen. 



JMust be pure i.e., containing nothing but 



\ bones and sulphuric acid. 



fTo be valued according to the following unit- 

 prices : nitrogen, 12s. ; soluble phosphate, 

 Is. 11^. ; insoluble phosphate, Is. 2d. ; potash, 

 3s. 3d. ; with an addition of 4s. per ton for 

 bags and 7s. Qd. per ton for mixing. These 

 units give the cash price at Leith and Glas- 

 gow. They apply only to mixtures made 

 from high-class materials. For instance, the 

 nitrogen of mixtures valued by these units 

 should not be from shoddy, hair or leather, 

 or the insoluble phosphates from ground 

 mineral phosphates. 



About 90 per cent, of the phosphate should be 

 citric soluble (official method of Board of 

 Agriculture). 



Fineness of grinding is of importance. The 

 coarsest kind used should be so finely ground 

 that at least 80 per cent, passes through a 

 wire sieve of about 9,600 holes per square inch. 



S.M. 



