APPENDIX I 



INSTRUCTIONS FOR VALUING MANURES 



Issued by the Highland and Agricultural Society of 

 Scotland. 



THE unit used for the valuation of manures is the hundredth part 

 of a ton, and as the analyses of manures are expressed in parts per 

 hundred, the percentage of any ingredient of a manure when multi- 

 plied by the price of the unit of that ingredient represents the value 

 of the quantity of it contained in a ton. 



As an example take muriate of potash : a good sample will be 

 guaranteed to contain 80 per cent, pure muriate of potash, the 

 other 20 per cent, consisting of unimportant impurities, such as 

 common salt. But all potash manures are valued according to the 

 amount of potash they yield, and 80 per cent, of pure muriate of 

 potash yields 50 per cent, potash (K 2 0) i.e., 50 units per ton ; and as 

 a ton of muriate of potash costs 8 15s., the price of the unit is the 

 fiftieth part of that, viz., 3s. 6d. If on analysis, a sample of muriate 

 of potash, guaranteed to contain 50 per cent, of potash, is found to 

 contain only 49 per cent., the price per ton will be 3s. Qd. less, viz., 

 $ 11s. Qd. 



Similarly with all other manures, the price per unit is derived from 

 the price per ton of a sample of good material up to its guarantee, 

 and therefore the proper price per ton of a manure is found by 

 multiplying the price per unit of the valuable ingredient by the 

 percentage as found by analysis. If a manure contains more than 

 one valuable ingredient, the unit value of each ingredient is multiplied 

 by its percentage, and the values so found when added together give 

 approximately the price per ton of the manure. 



Nitrate of soda contains no ammonia, but it contains nitrogen, and 

 14 units of nitrogen are equivalent to 17 units of ammonia. 



