INFLUENCE ON LINSEED OIL OF SOURCE OF FLAX, ETC. 15 
With regard to the physical properties of the oils it will be seen that 
in most cases the station averages differ considerably from year to 
year. 
A relationship appears to exist between specific gravity and color. 
the oils with the highest specific gravity being invariably lighter in 
color. 
No relationship appears to exist between the acid value of the oils 
and the station at which they are produced. This is to be expected 
when it is considered that the acidity of an oil is due perhaps more 
to conditions of harvesting, handling, and storage of the seed than 
to agricultural factors. 
Tne in din values as well as the drying tests of the oils, from the 
standpoint of the stations, bear about the same relationship as the 
specific gravities. Since the iodin value is due to certain constituents 
in the oil, this particular property is doubtless influenced very much 
by the growth of the plants, which in turn is affected by the location 
of stations and changed climatic conditions. 
The yields of oil from the different flax varieties varied consider- 
ably. Some varieties maintained comparatively high average yields 
during the two seasons under observation. The variability^ of the 
oil yields may be attributed to varietal differences in the plants in 
conjunction with conditions of growth and season. 
It appears that certain of the Cereal Investigations numbers, such 
as Xos. 19 and 3, grown at the several stations during two successive 
seasons yielded constantly high percentages of oil. The other varie- 
ties, Xos. 12 and 13, show constantly low yields of oil. 
Distinct differences are also noted in the specific gravities of the 
•oils from the several varieties under consideration Nos. 13 and 3 
averaged higher than Nos. 12 and 19. 
A marked fluctuation in acidity is noticed among the various 
Cereal Investigations numbers, no apparent relationship existing be- 
tween them. The iodin values, on the other hand, bear a definite 
relationship to the Cereal Investigations numbers. Nos. 12 and 13 
maintained high average iodin values, while Nos. 3 and 19 averaged 
somewhat lower from year to year. In the drying tests the varieties 
wmich show a tendency to dry rapidly or slowly are dependent to a 
large extent upon a combination of high iodin value with high specific 
gravity or high acid value. 
CONCLUSIONS. 
In conclusion, it may be stated that the results of the investiga- 
tion show that varieties of flax possessing agronomic differences also 
differ in both the physical and chemical properties of the oils. Va- 
rieties possessing certain properties maintain these properties to a 
marked degree from season to season. From these results it may 
