CHEMICAL DEPARTMENT. 45 



INSTRUCTIONS FOR VALUING MANURES. 



The commercial values of Manures are determined by means of the 

 Units in the following manner : — 



Take the Analysis of the Manure, and look for the following 

 substances : — 



Phosphates dissolved (or soluble phosphates) 1 ^^ ^^^^^^ .^^^^^ ^^^^^ 

 „ undissolved (or insoluble „ ), ', ^j^^^^ ^^.^ ^^ ^^^ 



^"^^f^"^'^' I valued. 



Potash, . . . . .J 



Should the Analysis or the Guarantee not be expressed in that umj, the 

 Chemist or the Seller should he asked to state the quantities in these 

 terms. 



Let us suppose the Manure is Bone Meal : — 



There are three classes of Bones, according to their fineness. An 

 ordinary Bone Meal will fall under Class (b), and it will contain 

 about 50 per cent. Phosphate and 4h per cent. Ammonia. The 

 units for Bones, Class (6), are 1/6 and 10/. Therefore the value 

 is — 



Insol. Phos., 50 times 1/6, equal to . J3 15 



Ammonia, 4| „ 10/, „ .250 



Say £6 per ton. 



Let us suppose the Manure is pure Vitriolated Bones : — 

 It must be guaranteed " Pure." 

 The units in the Schedule are 3/, 1/6, and 10/. 



The Analysis will be about 15 per cent, soluble Phosphate, 20 per 

 cent, insoluble Phosphate, and 3h per cent. Ammonia. In that 

 case the value would be — 



Sol. Phos., 15 times 3/, equal to . .£250 

 Insol. „ 20 „ 1/6, „ . . 1 10 



Ammonia, 3^ „ 10/, „ . . 1 15 



Say £o 10 per ton. 



If the Manure is a Superphosphate, — say an ordinary Superphosphate, 

 with 28 per cent, soluble Phosphate and 3 per cent, insoluble 

 Phosphate, it falls under Class (b) in the Schedule, and is valued 

 thus — 



Sol. Phos., 28 times 1/8, equal to . .£268 per ton. 

 Insoluble Phosphate is not valued in a Superphosphate. 

 If the Manure is a Dissolved Manure, such as Dissolved Bones not 

 guaranteed pure, or a special Manure, such as a Turnip or Potato 

 Manure, it will be valued according to the units under " Dissolved 

 Manures," the average units for which are 2/, 1/3, 10/, and 3/3 in the 

 Schedule. Thus, a Turnip Manure containing 20 per cent. sol. Plios., 

 10 per cent, insol. Phos., 4 per cent. Ammonia, and 2 per cent. Potash, 

 would be valued thus — 



Sol. Phos., 20 times 2/2, equal to 

 Insol. do., 10 ,, 1/3, „ 

 Ammonia, 4 „ 101, ,, 

 Potash, 2 „ 3/3, „ 



£5 2 4 per ton. 



