178 Prof. H. Rose on the Inorganic Constituents 



the carbonization, and this caused the conversion of so large 

 an amount of carbonate of potash into potash. 



The above constituents, when calculated as salts, yield the 

 following composition :- 



98-87 



On calculating the hydrate of potash as the carbonate, the 

 composition of the aqueous extract would be — 



Chloride of potassium .... 1*35 



Potash 66-28 



Phosphoric acid 12 "54 



Sulphuric acid 2*03 



Carbonic acid 16*61 



Silica 1-19 



or 



100-00 



The aqueous extract of the carbonized straw did not con- 

 tain any free potash. The constituents of the extract, when 

 calculated as salts, give the following composition : — 



Chloride of potassium .... 3-82 



Chloride of sodium 9-71 



Sulphate of potash 3*06 



Carbonate of potash 79'53 



Tribasic silicate of potash . . . 4*46 



Sulphate of lime 0'77 



101-35 



Muriatic extract. — The carbonized seeds, after exhaustion 

 with water, did not effervesce on the addition of muriatic acid; 

 the straw, however, did so copiously. 



