Journal of Agricultural Research 
Vol. II, No. a 
138 
a lesser degree. This difference appears to be fairly constant from sea¬ 
son to season. The same general direction of the California oils dur¬ 
ing the three seasons is most striking. The curves of the oils of the 
1906 crop further emphasize the strong dextro rotation of the oils from 
the foreign and New York hops as compared with the California and 
Oregon oils. 
