• 232 DR. DAUBENY ON THE ROTATION OF CROPS, ETC. 



Beans. 

 Shifting crop. 

 100 parts of crop yielded 5*7 of ashes, 100 parts of which consisted of- 



Sand and charcoal 8*24 



Peroxide of iron . 3*77 



12-01 



Soluble silica 3-97 



Phosphoric acid 3*83 



Sulphuric acid 2*49 



Carbonic acid 18*45 



Chloride of sodium 1*23 



Soda 0-22 



Potass 20-56 



Magnesia 3-79 



Lime 33-87 



88-41 

 12-01 



Real ingredients .... 76*40 



Beans. 

 Permanent crop. 

 100 parts of crop yielded 4*4 of ash, 100 parts of which consisted of — 



Sand and charcoal, extraneous . . . 6*13 

 Peroxide of iron, extraneous .... 4*24 



10-37 



Soluble silica 4-05 



Phosphoric acid ........ 3*29 



Sulphuric acid 1*96 



Carbonic acid 19*87 



Chloride of sodium 1 '00 



Soda 7*00 



Potass 12*77 



Magnesia . 3*63 



Lime 35*76 



99-70 

 10-37 



Real ingredients .... 89-33 



