134 
Journal of Agricultural Research 
Vol. II, No. 2 
Table V .—Specific gravity of fractions of hop oils for the years igo6 to iqoq, inclusive — 
Continued. 
1007 CROP (AT 25 0 C.). 
Source of hops. 
Fraction 
i, —i6s°C. 
Fraction 
2, 165° C. 
to 170 0 C. 
Fraction 
3, 170 0 C. 
to i8 s °C. 
Fraction 
4 . 18s 0 C. 
to 225° C. 
Fraction 
s,225°C. 
to 260 8 C. 
Fraction 
6, 260 8 C. 
to 275° C. 
Fraction 
7, 
to 290 C 
California: 
Perkins. 
o. 803 
O. 806 
0.815 
O. 843 
0.87s 
O. 889 
0. 876 
Cosumne. 
. 809 
.811 
. 819 
. 840 
*87 5 
.871 
.862 
Ukiah. 
.806 
. 810 
. 824 
.848 
.881 
. 891 
.881 
Wheatland. 
. 809 
. 810 
.816 
• 843 
•893 
. 900 
• 89s 
Oregon. 
. 809 
. 8ir 
.816 
• S55 
.889 
• 89s 
.876 
New York. 
. 812 
. 821 
• 853 
.884 
. 891 
.876 
Imported (Saaz) . 
. 812 
.832 
.874 
.887 
.878 
1908 CROP (AT 23' 
C.). 
California: 
Perkins. 
O. 802 
0. 805 
O. 809 
0. 834 
0.883 
0. 871 
0.866 
Cosumne. 
.805 
. 804 
. 8lO 
•835 
.884 
.894 
.880 
Ukiah. 
.803 
. 804 
.808 
• 83s 
.882 
.888 
.863 
Wheatland. 
.805 
.806 
. 8ll 
.837 
.885 
.894 
.88a 
Oregon. 
. 802 
. 801 
.806 
.828 
. 38 5 
. 890 
.883 
New York. 
. 8lO 
.813 
. 842 
.889 
.897 
•897 
Washington. 
.803 
.80s 
. 809 
•835 
.881 
.88 7 
•874 
Imported (Saaz) . 
.811 
.813 
. 840 
. 38 S 
. 890 
.876 
1909 CROP (AT 23 8 
C.). 
California: 
Perkins . 
O. 812 
O. 815 
O. 821 
0. 844 
0.879 
0.863 
0. 876 
Cosumne . 
. 820 
. 822 
.832 
•8ss 
. 891 
.888 
•87s 
Ukiah . 
.806 
. 807 
. 8lO 
• 833 
.873 
. 891 
.881 
Wheatland . 
.803 
. 807 
.812 
.831 
. 872 
. 872 
.888 
Oregon... 
. 806 
. 806 
.811 
.831 
.880 
.894 
.889 
New York.•. 
.823 
. 819 
.828 
• 859 
. 890 
. 900 
.886 
Washington. 
.808 
.808 
.813 
.836 
.884 
•89s 
.883 
Imported (Saaz) . 
, 8lO 
. 816 
• 837 
.876 
.882 
. 872 
The specific gravity, although less inclined to indicate material differ¬ 
ences, at least conveys some idea of the composition of the succeeding 
fractions. The low-boiling fractions naturally possess the lowest specific 
gravity, which increases as the constituents of greater density make their 
appearance in the later fractions. When the specific gravity is fairly 
constant the fractions may contain similar constituents in similar propor¬ 
tions. A rapid rise during distillation signifies a quick change and a 
sharp separation of the denser compounds. Sudden increases in specific 
