226 DR. DAUBENY ON THE ROTATION OP CROPS, ETC. 



Turnips. 



Shifting crop. 



Sand and charcoal 4'01 



Peroxide of iron 3*81 



7*82 



Silica • . 330 



Phosphoric acid 10-77 



Sulphuric acid 9'43 



Carbonic acid 8*66 



Chloride of sodium O'OO 



Chloride of potassium 5'40 



Potass 38-46 



Magnesia 5*08 



Lime 10*44 



99-42 



7-82 



Real ingredients . . . . 91-60 



Permanent crop. 



Sand and charcoal 3*92 



Peroxide of iron 2-80 



6-72 



Silica 2-67 



Phosphoric acid 12-80 



Sulphuric acid 11*07 



Carbonic acid 975 



Chloride of sodium 1-74 



Soda 0-00 



Potass 39-44 



Magnesia 3-83 



Lime 11*81 



9973 

 6-72 



Real ingredients .... 93-01 



Here also there is a pretty near coincidence between the analysis of Mr. Way and 

 that of BoussiNGAULT, excepting in the amount of phosphoric acid, which corre- 

 sponds nearly to that reported by Sprengel, with whom however in other respects 

 there is but little agreement, as will appear from the following Table : — 



