248 



127. AXALYSIS OF ASHES. 



Analysis of the ash of hops. (Wheeler.) 



Potassa , 



Soda 



Lime , 



Magnesia 



Ferric oxide 



Manganous manganic oxide 



Alumina , 



Pliosplioric acid 



Sulpburic acid 



Potassic cliloride , 



Sodic cliloride 



Silicic acid , 



Carbonic acid 



Ciiareoal and sand 



Total ash 



II. 



THE ASH OF ANIMAL SUBSTANCES. 



127. Animal substances are incinerated with difficulty, 

 particularly when they fuse before they become charred; 

 the attempt should be made, however, to burn them with- 

 out the addition of any agents. 



First char the dry substance in a j^latinum dish, raising 

 the heat very slowly, so as to avoid fusion, if possible ; 

 when the charring has attained such a point that water is 

 no longer colored when left for a time in contact with tlie 

 coal, break the coal up into a coarse powder, and boil and 

 wash it several times with water, acidified with a little 

 nitric acid in case no carbonates are present, or carbonic 

 acid is not to be determined ; then dry the coaly residue 

 and complete the incineration in the muffle, at a barely 

 visible red heat. 



Sometimes it will be found necessary to repeat the 

 exhaustion with water and heating in tlie muffle several 

 times, before the incineration can be completed. 



