55 



practically quiescent air, the other in which a battery of brine pipes 

 is placed outside the store, which is cooled by a current of air drawn 

 over these pipes and circulating through the room. It is no doubt 

 an advantage to have the pipes outside the storage chamber, thus 

 preventing any drip should the temperature rise considerably through 

 stoppage of machinery ; but there is the drawback that circulation 

 of air may mean withdrawal of essential oils, and the writer has 

 satisfied himself that such does to a small extent occur, though its 

 importance is lessened by the fact that the same air is continuously 

 used for circulation. 



When adopting the last-named system care must be taken that 

 the pockets are so stacked as will permit of the free circulation of air 

 between them, otherwise very considerable differences of temperature 

 are observable. 



From an examination of a number of hops stored on the two 

 systems the writer gives the preference to that with quiescent air, 

 though undoubtedly the other system also gives very good results. 



It is interesting to inquire to what extent such cold storage does 

 preserve. Statements have been made that all hops placed in cold 

 store remain absolutely unchanged, even after the expiration of seven 

 to ten years. Such a statement is not, however, accurate. Cold 

 storage reduces, but it does not always entirely arrest change. For 

 practical purposes, however, a cold stored hop, if of good quality, 

 undergoes very little deterioration in the course of one or two years, 

 and it is not necessary for commercial reasons to go much beyond 

 this period. 



The behaviour of hops when cold stored varies considerably. 

 Some hops will, as above mentioned, remain practically unchanged, 

 except for slight alteration in the oil, for a long period of time, but 

 other hops undergo distinct deterioration despite cold storage ; 

 though, in every case, the deterioration is very much less than 

 would occur under ordinary storage conditions. The results of the 

 examination of a number of samples made by the writer with a view 

 to gaining information upon this point, seem to point to the fact 

 that hops placed in cold store containing a considerable amount of 



