132 
Journal of Agricultural Research 
Vol. II, No. a 
first four fractions, the Cosumne oil showing slight deviation. The curve 
of the first four fractions of the imported oil is again far below that of any 
of the other oils. From fraction 4 the New York oil follows a similar 
course to that of the imported oil. Fraction 5 (22 5 0 to 260° C.), in both 
the imported and the New York oils, shows the highest percentage. The 
similarity of the Oregon and Washington oils is noteworthy, both curves 
following almost identical lines. 
As a general thing, it will be observed that the oils from the California, 
Oregon, and Washington hops during the several seasons showed a high 
Fig. 4. —Fractionation curves of hop oils from the crops of 1908. 
content of low-boiling constituents, while the oils from the imported hops 
were invariably poorer in the low-boiling constituents. On the other 
hand, the oils from the imported hops seemed, generally speaking, to con¬ 
tain much higher percentages of the high-boiling compounds, as shown 
by fractions 4 and 5; the oil of the 1908 crop, however, was unique in 
that it appeared to be similar to the other oils during that particular 
season. The curves of the imported oils followed those of the New York 
oils the most closely, the general direction being similar. The California 
oils also followed very similar directions, as did the Oregon and Washing¬ 
ton oils. 
