28 



soluble phosphate, i per cent, insoluble phosphates, and 2 per cent, 

 potash, the real value would be io8s. for the nitrogen, 2os. for the 

 soluble phosphates, 2s. for the insoluble phosphates, and 8s. for the 

 potash, the total being 6 i8s. a ton. 



P.S. The prices of the manures are very variable, and the figures 

 given would probably have to be raised considerably as time goes on. 



P. P.S. As regards purchasing proprietary manures, it is often more 

 economical to buy the separate ingredients, and mix them together, 

 than to buy the advertised mixture ; in this way also substances of 

 no manurial value, such as sand, do not have to be paid for. 



