AND CHEMISTRY OF HOPS. 15 



1. Water. 



2. Essential oil. 



3. Acetate of ammonia. 



4. Malate of lime. 



5. Albumine. 



6. Gum. 



7. Malic acid. 



8. Tannic acid. 



9. A resin. 



10. Bitter eitract. 



11. A fatty matter. 



12. Chlorophyl. 



13. Acetate of lime. 



14. Nitrate and sulphate of 



potash, 



15. Sub-carbonate of potash. 



16. Carbonate and phosphate 



of lime. 



17. Phosphate of magnesia. 



18. Sulphur. 



19. Oxide of iron. 



20. Silica. 



In therapeutics, lupuline plays an important part, but the 

 properties of the etherized narcotic extract, and those of a 

 crystalline acid, in very bitter silky needles, which might be 

 called hunaulin, have never been experimented on, and would 

 probably be found powerful substitutes for opium and 

 quinine. 



The Utter substance of hops is a yellow solid matter, not 

 very soluble in water, easily soluble in alcohol, less soluble 

 in ether ; it is odourless and of a very bitter flavour ; has 

 a feeble tendency to combine as easily with the metallic 

 bases as with the acids. The resin of hops may be obtained 

 pure by the action of boiling water. In the pure state 

 this resin is free from all bitter flavour, it is insoluble in 

 water ; but is, on the contrary, very soluble in alcohol and in 

 ether. The resin of hops has been the object of research by 

 Vlaanderen. He treated the hop dust with boiling alcohol, 

 then filtered it, added a considerable quantity of water, and 

 evaporated it. In the yellow, cloudy liquor a soft resin of a 

 dark brown colour is thrown down ; this is separated from the 

 liquor, again dissolved in alcohol, filtered, once more mixed 

 with a large quantity of water, and evaporated, for the pur- 

 pose of separating as much as possible by this evaporation 



