[ 5* ] 



VIII. On the Analysis of Hop-Ash. By Henry Watts, 

 B.A., Assistant in the Laboratory of University College, 

 London.* 



''I^HE hops, the ash of which forms the subject of the fol- 

 -■- lowing analysis, were of the variety called "the Grape." 

 They were grown last year at Hawkhurst in Kent, on a good 

 soil, being a stiff clay loam resting on the Hastings sand. 

 The produce was 12 cwt. per acre, which is rather above the 

 average produce of the district, the quantity being ascertained 

 after the hops had been taken from the kiln, cooled and 

 bagged. 



The hops in this state lost 11 i per cent, by drying at 212°. 



1000 grs. of the hops in the same state bm*nt in an earthen 

 crucible yielded in four experiments, 62, 65, 67 and 64 grs. 

 of ash. The mean of these is 64*5 ; hence the quantity of 

 ash is about 6| per cent. 



The appearance of the ash was highly ferruginous. 



Qualitative Analysis. 



A portion of the ash was exhausted with water, and the 

 soluble and insoluble portions separately examined. 



The soluble portion of the ash was found by the usual re- 

 agents to contain carbonic, sulphuric, phosphoric and silicic 

 acids and chlorine. The bases were potash and a little soda. 



The insoluble portion, in like manner, was found to con- 

 tain lime, magnesia, alumina and peroxide of iron, in combi- 

 nation with carbonic and phosphoric acids, together with a 

 considei'able quantity of siliceous sandy matter insoluble in 

 acids, and a little unburnt charcoal. This after ignition was 

 further examined by fusion with carbonate of soda, and found 

 to consist of silica, with traces of alumina, oxide of iron and 

 lime. The presence of phosphate of alumina being unex- 

 pected, great pains were taken in this part of the analysis to 

 place the matter beyond question. 



Quantitative Analysis. 

 A. Proportions of soluble and insoluble matter. 



1. 100 grs. of the ash (recently ignited) were boiled in 

 water. The insoluble portion was collected on a weighed fil- 

 ter and thoroughly washed. 



Insoluble matter dried at 300° weighed 64-72 grs. 

 Therefore soluble matter ... 35*28 ... 



* Communicated by the Chemical Society; having been read May 3, 

 1847. 



