18 BULLETIN 282, U. S. DEPARTMENT OF AGRICULTURE. 
(3) This change was not so pronounced in the hops kept in open storage, irrespective 
of treatment at the dry kiln. On comparison, however, the unsulphured hops showed 
the greatest change. 
(4) The most decided change occurred in the unsulphured hops in cold storage and 
ef on marked change in the sulphured hops in open storage. 
After the first year the degree of change in all the samples fluctuated ALE regu- 
es from year to year. Taken in the aggregate, the values as determined from year 
to year indicate most strongly that an extensive rearrangement took place in the soit 
resins of the hops from the time they were picked until some point was reached between 
the first and second year of storage. When this point was reached and the rearrange- 
ment had practically terminated, a gradual increase or decrease could be traced in all 
the values taken. 
SUMMARY. 
In 1911, material for a comparative study of the soft resins of 
sulphured and unsulphured hops in both cold and open storage was 
secured from a hop ranch at Perkins, Cal. The green hops were 
divided into two lots, one of which was sulphured during the process 
of drying. The dry sulphured and unsulphured hops were again 
divided into lots, sealed in tin cans, and shipped to Washington, 
D.C. On arrival the cans were opened and an analysis made of one 
lot each of the sulphured and unsulphured hops. The remaiming 
samples were baled in burlap and three samples each of the sulphured 
and unsulphured hops were placed in both cold and open storage. 
At the end of the first, second, and third years of storage one 
sample each of the sono and soecinioee hops was withdrawn 
from both cold and open storage and an aalyels made of each. The 
hops analyzed in 1911 are designated as ‘“‘original hops,” since they 
approximate more nearly the condition of the samples at the time of 
drying. 
A physical valuation was placed on the original samples and also 
on the hops as they were withdrawn from storage from time to time. 
From these valuations the conclusions are drawn that both sulphuring 
and cold storage retard changes in the physical characteristics of hops. 
A combination of the two factors is more effective in retarding these 
changes than either factor alone. : 
Determinations were made of the moisture, the percentage of soft 
resins, hard resins, and total resins, of the color, odor, and taste of the 
soft resins, and of the acid, ester, saponification, and iodin values of 
the soft resins. 
The moisture content in the sulphured and unsulphured hops held 
in cold storage increased during the first year and then remained 
practically constant in all the samples throughout the period of 
storage. The moisture content of the sulphured and unsulphured 
hops in open storage varied from year to year, according to existing 
weather conditions. 
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