AND CHEMISTRY OF HOPS. 



13 



found as a minimum 8 per cent., and as a maximum 18 per 

 cent, of hop dust. It is a well-known fact that the hops of 

 different countries are not equally good; the difference in 

 the quantity of the yellow powder may, among others, be one 

 of the causes ; but, as in the manipulations which the hops 

 undergo, the yellow powder may be easily detached, it would 

 be wrong to conclude from the experiments of Payen and 

 Chevallier, that, in the hops as they are in the field, there 

 exists such a difference in the quantity of powder ; during 

 the carriage a small quantity may in some way or other be 

 lost. 



Wimmer found in 100 parts of hops 20 parts of powder 

 to 80 parts of scales. But as it was impossible to separate 

 from the flowers- all the particles of yellow dust held, he 

 was of opinion that about half more ought to be added. He 

 found, by analysis, the following percentages : 



Watery extract 



Lupuline. This name has been given by Ives to the 

 yellow dust which covers the folioles of the female flower of 

 hops. Later on Ives, Payen, Chevallier, and Pelletan gave 

 the same name to the bitter substance contained in the 

 dust. 



