SOFT EESINS IN SULPHURED AND UNSULPHUKED HOPS. 7 



Table III. — Decrease in the soft resins of sulphured and unsulphured hops in cold mid 

 in open storage compared with the soft-resin content of the original samples. 



Treatment at the kiln. 



Original 



sample, 



1911. 



Cold storage. 



Open storage. 



1912 



1913 



1914 



1912 



1913 



1914 





Per cent. 

 100 

 100 



Per cent. 

 3.32 

 12.98 



Per cent. 

 6.98 

 22.47 



Per cent. 

 59. 57 

 65.89 



Per cent. 



8.11 



21.84 



Per cent. 

 26.71 

 33.48 



Per cent. 

 74.02: 





79.23 







From Table III, in which the soft-resin content in the original 

 samples is considered as 100 per cent, it is evident that the decrease 

 in the sulphured hops during the first two years in cold storage was 

 not great, but it was rapid during the third year. In open storage 

 the decrease was very pronounced during each year. The unsul- 

 phured hops in cold storage show a marked decrease, which was 

 greatest in the third year, and in open storage the decrease was even 

 more pronounced year by year. 



HARD RESINS. 



The hard resins in the various samples of hops used in this study 

 were also determined. A portion of the hops after being extracted 

 with petroleum ether was again extracted with ether, the ether 

 recovered, and the weight of the residue returned as hard resin. 

 By this method an extra calculation is necessary, but in using large 

 quantities of hops the time consumed is more than compensated for 

 in the accuracy obtained. 



The hard-resin content of the various samples is shown in Table IV. 



Table IV. — Hard resins in the original samples of sulphured and unsulphured hops 

 and in samples kept in cold and in open storage. 



Treatment at the kiln. 



Sulphured 



Unsulphured . 



Original 



sample, 



1911. 



Per cent. 

 5.26 

 6.43 



Cold storage. 



Per cent. 

 6.53 

 8.35 



Per cent. 

 8.97 

 10.08 



Per cent. 

 9.90 

 10.05 



Open storage. 



1912 



Per cent. 

 8.32 

 9.53 



Per cent. 

 9.09 

 10.45 



Per cent. 

 10.10 

 10.46 



The figures in Table IV give an index of the change in the quantity 

 of hard resins that took place in the various hop samples. The 

 greatest change occurred in the unsulphured hops in open storage 

 and the least change in the unsulphured hops during the first two 

 years in cold storage. The difference in the content of hard resins 

 of both sulphured and unsulphured hops in cold and in open storage, 

 respectively, became materially less in the third year of storage and 

 probably indicates that the changes which took place in the hops 



