8 BULLETIN 282, IT. S. DEPARTMENT OF AGRICULTURE. 



tended to reach a state of equilibrium irrespective of the treatment 

 of the sample. 



Figure 2 gives a graphic representation of the increase in the hard- 

 resin content of sulphured and unsulphured hops in cold and in open 

 storage. 



During the first year the increase in the hard-resin content in 

 the sulphured hops was greater in open storage than in cold storage. 

 At the end of the second year the sulphured hops hi both cold and 



open storage con- 

 tained about the 

 same percentage of 

 hard resins. The 

 unsulphured hops 

 followed the same 

 lines, but did not 

 present quite so 

 marked a difference 

 during the first year 

 of storage. At the 

 end of the third 

 year the hard-resin 

 content in all the 

 samples had become 

 uniform and a state 

 was reached where 

 the increase, if any, 

 was very slow. 



Table V gives the percentage of increase in the hard-resin content 

 of the various samples as compared with the original, the hard-resin 

 content of the latter being considered as 100 per cent. 



Table V. — Increase in the hard resins of sulphured and unsulphured hops in cold and 

 in open storage, compared with the hard-resin content of the original samples. 



VSAAS //V STOPAGE 

 Fig. 2. — Curves of the percentage of hard resins in sulphured and un- 

 sulphured hops in cold and in open storage. 



Treatment at the kiln. 



Original 



sample, 



1911. 



Cold storage. 



Open storage. 



1913 



Sulphured 



Unsulphured. 



Per cent. 

 100 

 100 



Per cent. 

 24.14 

 29.85 



Per cent. 

 70.53 

 52.75 



/'( r i'i Hi. 

 88.21 

 56.29 



Per cent. 

 58.17 

 IS. 21 



Per cent. 

 72. SI 

 62. 51 



Per cent. 

 92. 01 

 62. 67 



The sulphured hops appeared to react less readily to changes that 

 bring about an increase in. the hard resins. From this it is inferred 

 that sulphuring is a factor that retards the changing of soft resins 

 to hard resins. This is shown most emphatically in Table V by the 

 fact that the percentage of increase hi the unsulphured hops was much 

 less in both cold and open storage than in the corresponding sulphured 





