DR. DAUBENY ON THE ROTATION OF CROPS, ETC. 



229 



The following will give a tabular view of the composition of the above three crops 

 in 100 parts, after deducting the extraneous matters present in the ash. 



Flax. 



Standard crop grown in the Botanic Garden apart from the spot reserved for the 

 experiments. 



100 grains of the crop, including the ripened seeds, yielded 10*7 of ash, of which 

 latter 100 parts contained — 



Sand and charcoal 12-02 



Peroxide of iron 3*42 



16-44 



Silica 1-77 



Phosphoric acid 6*85 



Sulphuric acid 5-10 



Carbonic acid 15*69 



Chloride of sodium 2*43 



Chloride of potassium 6*04 



Soda 0-00 



Potass 21*73 



Magnesia . . . 3*89 



Lime 18*30 



97*24 

 15*44 



Real ingredients . . . . 81*80 



2 H 2 



