12 
BULLETIN 655, TJ. S. DEPARTMENT OF AGRICULTURE. 
yearly averages and general averages were computed from the data 
given in Tables II and III, and the results are presented in Table V. 
Table V. — Comparison of yield, specific gravity, acid value, iodin value, and time of 
drying of oils from flax grown at seven different stations in 1914 and 1915. 
[The stations where the seed samples were grown are designated by numbers as follows: No. l=Moccasin, 
Mont.; No. 2=Dickinson, X. Dak.; No. 3=Mandan, N. Dak.; No". 4=Newell, S. Dak.; No. 5=Highmore, 
S. Dak.; No. 6= Archer, Wyo.; No. 7= Burns, Oreg.] 
Station. 
Yield of oil (per 
cent). 
Yearly 
average 
No. 1. 
No. 2. 
No. 3. 
No. 4. 
No. 5. 
No. 6. 
No. 7. 
34. 35 33. 87 
34. 52 34. 82 
33. 74 34. 93 
32. 97 35. 81 
34. 32 35. 67 
33. 35 38. 79 
34. 30 33. 26 
34.11 
34.67 
34.33 
34. 39 
35.00 
36.07 
33.78 
Specific gravity. 
Yearly 
average. 
Acid value. 
Yearly 
average. 
tf 3 
2« 
ti 
I" 
9274 0. 9290 0. 9282 6 0. 797 0. 707 0. 752 
9307 .9292 .9299 11.025 .820 
9279 .9298 .9288 41.057 .785 
9274 .9293 .9283 51.070 .737 
9272 .9286 .9279 71.285 .695 
9276 .93L2 .9294 2 .775 .947 
9279 .9299 .9289 3 .975 .507 
Iodin value. 
Yearly 
average. 
Time of drying 
(days). 
Yearly 
157. 8 154. 7 156. 2 7 17. 12. 2 14. 6 
13.6 
14.1 
22.3 
18.7c 
11. 9c 
13. 7c 
922 2167.2 162.7164.9 
921 3161.9 161.6161.7 
903 4157.7161.8159.7 
990 1157.4162.1159.7 
861 5166.6171.8169.2 111.712.2 
741 7161.8158.4 160.1 4!1S. 5 9.0 
2 7 20.2 
3 10 18. 2 
5 23.6 21.0: 
6 22. 5 15. 
The results given in Table V show that the yield of oil from the 
groups of samples at the stations mentioned are for the most 
part fairly constant during the two seasons. The yield during 1914 
was uniformly lower than in 1915 with two exceptions. Burns, 
Oreg., and Moccasin, Mont., averaged slightly higher in 1914 than 
in 1915. 
The amount of precipitation at each station during the growing 
months in 1914 and 1915 is perhaps the most influential factor in 
affecting the yield of oil, since the proper growth and maturity of 
the flax plants are dependent largely upon the amount of moisture 
available to the plants. By consulting Table I it will be observed 
that the precipitation during the growing months in 1914 was less at 
all stations except one (Dickinson, N. Dak.) than in 1915. It is 
singular to note that when the greatest differences occurred in the 
yield of oil at these stations there was also the greatest difference in 
precipitation. Thus, samples from Newell, S. Dak., and Archer 
Wyo., gave much higher yields of oil in 1915 than in 1914. The pre- 
cipitation at these stations during the growing months was likewise 
much greater in 1915 than in 1914. 
The yield of oil from the samples from Moccasin, Mont., in 1914 
(34.35 per cent) is but slightly higher than in 1915 (33.87 per cent). 
The precipitation during the growing months of these two seasons 
also shows but slight variation. Samples from Burns, Oreg., show a 
higher yield of oil in 1914 (34.30 per cent) than in 1915 (33.26 per 
cent). The precipitation was likewise greater in 1914 (4.27 inches) 
than in 1915 (2.90 inches). 
