16 BULLETIN 282, U. 
. DEPARTMENT OF AGRICULTURE. 
Figure 8 shows the various values as found in the sulphured hops 
in open storage. The acid value, which remained almost constant 





/ 2 
JERS (MN STORAGE 
Fic. 8.—Curves showing the correlation of chemical values of the soft 
resins in sulphured hops in open storage. 

during the first year 
of storage, gradually 
diminished during 
the next two years. 
The ester value, 
which increased 
somewhat during the 
first year, Imcreased 
rapidly during the 
second and _ third 
years, Indicating that 
the esterification was 
slightly in advance of 
the formation of free 
acids at all periods of 
storage and became 
more pronounced at 
the close of the third 
year. The  iodin 
x 
value gradually increased, indicating the continuous formation of 
unsaturated compounds in the soft resins throughout the entire period 
of storage. The 
saponification value 
gradually increased 
throughout the 
period of storage. 
Figure 9 gives a 
graphic illustration 
of the various values 
as found in the un- 
sulphured hops in 
cold storage. The 
acid value gradually 
increased throughout 
the period of stor- 
age. The ester value 
diminished during 
the first year of stor- 
age, increased some- 
what during the sec- 

7 2 
YEARS 1 STORAGE 
Fig. 9.—Curves showing the correlation of chemical values of the soft 
resins in unsulphured hops in cold storage. 
ond year, and in the third year the increase was rapid. Figure 9 
shows also that esterification did not keep pace with the formation of 
free acids during the first year of storage. 
However, during the next 

