^2^0 



DR. DAUBENY ON THE ROTATION OF CROPS, ETC. 



Shifting crop. 



100 grains of the crop yielded 8'0 of ashes, 100 grains of which consisted of- 



Sand and charcoal . . . . v - -i . 13*15 

 Peroxide of iron . . . ..... 5*41 



18-56 



Silica 1-82 



Phosphoric acid . . , 6-77 



Sulphuric acid . . . . . . . . . 4*18 



Carbonic acid . ... ..... 17*38 



Chloride of sodium 1*58 



Soda . . . . . 1-05 



Potass 20-5 1 



Magnesia .......... 4*72 



Lime 21*56 



Real ingredients 

 Flax. 



98*13 

 18-56 



79*57 



Permanent crop. 



100 grains of the crop yielded 6*675 of ash, 100 grains of which consisted of- 



Real ingredients 



84*75 



