10 



BULLETIN 282, U. S. DEPARTMENT OF AGRICULTURE. 



Table VII. — Soft resins in the original samples of sulphured and unsulphured hops 

 and in samples kept in cold and in open storage, calculated with reference to the total 

 resins. 



Treatment at the kiln. 



Original 



sample, 



1911. 



Cold storage. 



Open storage. 



1912 



1913 



1914 



1912 



1913 



1914 





Per cent. 

 70.13 

 63.46 



Per cent. 

 64.59 

 53.79 



Per cent. 

 56.08 

 46.21 



Per cent. 

 33.47 

 27.49 



Per cent. 

 57.63 

 47.80 



Per cent. 

 49.83 

 41.55 



Per cent. 

 24.06 





18.15 









The data in Table VII show that the sulphured cold-storage hops 

 retained a greater percentage of soft resins each year than did any of 

 the other samples. The unsulphured hops in cold storage and the 

 sulphured hops in open storage contained year by year practically the 

 same percentage of soft resins, as calculated with reference to the 

 total resins. The greatest decrease is noted in the soft resins from 

 the unsulphured hops in open storage. 



CHANGES IN THE COMPOSITION OF THE SOFT RESINS. 



That chemical changes take place in the soft resins of hops is a 

 foregone conclusion. In order to study these changes, methods in 

 general use in chemistry, with some modifications, were applied to 

 the soft resins with satisfactory results. The physical properties of 

 color and odor presented in Table VIII were observed from year to 

 year. 



Table VIII. — Physical properties of the soft resins in the original samples of sulphured 

 and unsulphured hops and in samples kept in cold and in open storage. 



Treatment at the kiln. 



Original sample, 

 1911. 



Cold storage. 



1912 



1913 



1914 



Color: 



Greenish brown. 

 Dark brown 



Aromatic, pleas- 

 ant. 

 do 



Dark brown 

 Very dark 

 brown. 



Aromatic, pleas- 

 ant. 



Aromatic, pun- 

 gent. 



Greenish brown. 

 do 







Do. 



Odor: 



Aromatic, pleas- 

 ant. 



Agreeable, hop- 

 like. 







pleasant. 

 Do. 









Treatment at the kiln. 



Original sample, 

 1911. 



Open storage. 



1912 



1913 



1914* 



Color: 



Greenish brown- 



Dark brown 



do 



Greenish brown. 

 do 







Do. 



Odor: 



Aromatic, pleas- 

 ant. 



do 



Aromalic. pleas- 

 ant. 



Aromatic, pun- 

 gent. 



Aromalic pleas- 

 ant. 



Aromatic, pun- 

 gent. 



Disagreeable, 

 somewhat aro- 

 matic. 

 Do. 











