228 DR. DAUBENY ON THE ROTATION OF CROPS, ETC. 



Hemp. 



Shifting crop. 



100 parts yielded 7*01 of ash, 100 parts of which consisted of-— 



Sand and charcoal 830 



Peroxide of iron 3*78 



12-08 



Silica 871 



Phosphoric acid 5*68 



Sulphuric acid 0*73 



Carbonic acid 20*10 



Chloride of sodium 0*63 



Chloride of potassium 0*00 



Soda 0-14 



Potass 7-49 



Magnesia 5*19 



Lime 39*00 



99-75 

 12-08 



Real ingredients .... 87*67 



Hemp. 

 Permanent crop. 

 100 parts yielded 6*00 of ash, 100 parts of which consisted of — 



Sand and charcoal 10*40 



Peroxide of iron 3*94 



14*34 



Silica 8*39 



Phosphoric acid 4*50 



Sulphuric acid r09 



Carbonic acid 19*78 



Chloride of sodium 0-43 



Soda 0-06 



Potass 7-25 



Magnesia , 2*18 



Lime . 40*10 



98*12 

 14*34 



Real ingredients .... 83*78 



