46 MISCELLANEOUS PAPERS. 



(4t) By the use of impure sulphur during the process of curing, 

 hops may be contaminated with arsenic, which will be concentrated 

 in the lower layers on the kiln floor with the result that certain sam- 

 ples may show an amount greater than 0.01 grain per pound. 



(5) The probability of hops acquiring arsenic from what seems to 

 be a very ready source may be much lessened by employing only the 

 very highest grades of purified sulphur in hop curing, and the quan- 

 tity used should be reduced to the lowest possible limit. 



121— iv 



