




SOFT RESINS IN SULPHURED AND UNSULPHURED HOPS. 7 
TaBuiE II1.—Decrease in the soft resins of sulphured and unsulphured hops in cold and 
in open storage compared with the soft-resin content of the original samples. 


| 
Original Cold storage. Open storage. 
Treatment at the kiln. sample, 
Wee 1912 1913 1914 1912 1913 | 1914 


B | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. 
Sulphuredss Sees Ass. sense | 100 3. 32 6. 98 59. 57 8.11 26. 71 74. 02 
Wmsulphured=.-s4-+-4-------25- | 109 12.98 22. 47 65. 89 21. 84 33. 48 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. 




4 Cold storage. shes Open storage. 
Original | 
Treatment at the kiln. sample, 
1911. 1912 1913 1914 1912 1913 1914 


Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. | Per cent. 
Striljoneirel we Se Gedo Seeckodd 5. 26 6. 53 8.97 9. 90 8. 32 9. 09 10. 10 
Wnsmlphunedse-=-s24---422- 2-8 6. 43 8.35 10. 08 10. 05 9. 53 10. 45 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 
