14 BULLETIN 282, U. S. DEPARTMENT OF AGRICULTURE. 
a study of the ester and acid values, a gradual increase in the saponi- 
fication value would beexpected. Thisincrease wasmost marked after 
the first year of storage, and all the samples gradually approached a 
uniform value. The saponification value of the soft resins from the 
sulphured hops was slightly higher than the same value in the un- 
sulphured hops. The increase in the saponification value was most 
uniform in the hops held in open storage and was most rapid during 
the third year in the unsulphured hops in cold storage. 
TaBLe X.—Saponification value of the soft resins in the original samples of sulphured 
and unsulphured hops and in samples kept in cold and in open storage. 


Cold storage. Open storage. 

Original 
Treatment at the kiln. sample, =e ee 
eas 1912 1913 | 1914 1912 1913 1914 
Sul phune detec secre 169. 5 266. 5 278. 5 317 | 195 264 324 
Wmsulphured).. 2.2225. 2-0 sess 182. 65 138. 5 163. 5 284 | 175.5 228. 5 236 

IODIN VALUE. 
In determining the iodin-absorption value of the soft resins, the 
method employed was that commonly used in determining this value 
in fats. The results obtained are shown in Table XI. 
TasBLE XI.—Jodin value of the soft resins in the original samples of sulphured and 
unsulphured hops and in samples kept in cold and in open storage. 

Cold storage. Open storage. 
Original 3 P ae 
Treatment at the kiln. sample, 
1911. 1912 1913 1914 1912 1913 1914 
Sil phured soak alan iyo eaeaey 95 76 144 156 123 132 156 
Wnsulphuredeey) fe. ae | 100 72 140 141 89 143 153. 
| 


The iodin values, as shown in Table XI and in figure 6, became 
less divergent in the third year of storage. In the soft resins from 
the sulphured hops im open storage the iodin value gradually increased 
for each year of storage. In all the other samples it diminished 
during the first year, rose rapidly durmg the second year, and in the 
third year was uniform with that from the sulphured hops in open 
storage. This indicates a diminution in the unsaturated compounds 
in the soft resins from the sulphured hops in cold storage and from 
the unsulphured hops in both cold and open storage and an increase 
in the unsaturated compounds in sulphured hops in open storage 
during the first year. It will be noted, however, that after the com- 
pletion of the marked readjustment that took place during the first 
year of storage, the iodin value of all the samples tended to become 
uniform, thus indicating that the unsaturated compounds were present 
in approximately thesame proportion in all the soft resins of all the hop 
samples at some point between the first and the second year of storage. 
