of Organic Bodies. 183 



Muriatic extract, — The residue consisted of — 



Wheat. Wheat-straw. 



Potash 14*40 



Soda 



Lime .... 

 Magnesia . . 

 Peroxide of iron 

 Phosphoric acid 

 Silica .... 



100-00 100-00 



In the muriatic extract of the wheat, all the bases com- 

 bined with phosphoric acid are in the form of 5-phosphates. 

 The quantity of phosphoric acid corresponding to these salts 

 amounts to 57*20 per cent. ; experiment gave only 54-77 per 

 cent. 



In the muriatic extract of the carbonized straw, the preci- 

 pitate produced by ammonia consisted of 8CaO + 3P05 + 2Fe2 

 O3 + 3P2O5; the phosphoric acid thus required amounts to 

 34*60 per cent. ; analysis yielded 33*54 per cent. The liquid 

 filtered from this precipitate still contained small quantities of 

 the carbonates of lime and magnesia. 



The exhausted carbonized mass. — The composition of the 

 ash was as follows : — 



Wheat-grain. Straw. 



100-00 100*00 



On calculating the bases in the ash of the residuary carbo- 

 naceous mass as i-phosphates, there is an excess of phos- 

 phoric acid, part of which formed a-phosphates. The bases 

 would require 44*19 per cent, phosphoric acid to form 

 Z'-phosphates. The principal constituent of the ash of the 

 straw was silica. The muriatic solution of the ash yielded 

 with ammonia a precipitate consisting of 8CaO + 31*2^5 + 

 2MgO+ P20,:;+ Fcg O3 + P2O5. The liquid filtered from this 

 precipitate still contained small quantities of lime and mag- 

 nesia, probably more than would correspond to the solubility 

 of the earthy phosphates in a solution of muriate of ammonia. 



The three divisions of the analysis of the grains and straw 

 of wheat gave — 



