EXPERIMENTS WITH FLAX ON BREAKING. 
19 
The specific gravity and the refractive index, being affected by the composition 
of the oils, were carefully determined. Both of these constants bear a certain rela- 
tionship to the composition of the oil. 
Table VI. — Physical and chemical determinations of the oils of the fourteen varieties and 
strains of flax grown on plats at the Northern Great Plains Field Station, Mandan, 
N. DaJ:.\ during 1914, 1915, and 1916. 
Variety. 
Specific gravity at 24° C. 
1915 
Aver- 
age. 
Index of refraction at 
24° C. 
1915 
1916 
Aver- 
Acid value. 
1915 
1916 
0.55 
0.89 
.60 
.67 
.86 
.63 
.78 
.70 
.88 
.80 
.89 
.85 
.76 
1.04 
.83 
1.11 
.76 
.98 
.56 
.94 
.62 
.81 
.98 
.64 
.78 
1.41 
.95 
.72 
Aver- 
age. 
R eserve 
Select Riga (N. Dak. No. 
1214) 
Damont (N. Dak. No. 1215). 
Select Russian (N. Dak. No. 
60S) 
Frontier (N. Dak. No. 155) . . 
N. Dak. No. 1221 
N. Dak. Resistant No. 52. . . . 
Stepan (N. Dak. No. 1340). . . 
Fargo Common (N. Dak. No. 
1133) 
Idaho Common 
N. Dak. Resistant No. 73.... 
Kazan (N. Dak. No. 1329) . . . 
N. Dak. Resistant No. 114. . . 
Primost (Minn. No. 25) 
0.9274 
.9284 
.9280 
.9278 
.9278 
.9289 
.9276 
.9272 
.9285 
.9280 
.9285 
.9276 
.9285 
.9278 
0. 9301 
.9290 
.9298 
.9291 
.9300 
.9294 
.9291 
.9299 
.9300 
.9294 
.9296 
.9293 
.9300 
.9292 
!i.'.i2y> 
.9280 
.9304 
.9272 
.9304 
.9300 
. 9305 
.9275 
.9279 
,9269 
.9274 
. 9345 
,9279 
0. 9286 
9291 
9283 
. 9289 
.9292 
1.4783 
1.4781 
1. 4781 
1. 47SS 
1. 4790 
1. 4777 1. 47 
1. 4774 1. 4781 
1.4775 1.4782 
1.07 
1.22 
1.11 
1. 4785 1. 4790 1. 4779 1. 4785 1. 11 
1. 4785 1. 4787 1. 4767 1. 4780il. 05 
1. 4792H. 4785, 1. 47751. 4784, 1. 09 
1. 4789 1. 4785 1. 47794. 4784 1. 08 
1. 4791 1. 4791 1. 4775 1. 4786 . 91 
.92871.4787 
. 9284 1. 4787 
.92831.4787 
.928111.4790 
,9310| 1.4795 
.92831.4790 
1.4783 1.4769 
1.4789 1.4777 
1.478811.4768 
1.4787 .4772 
1.47904.47861.4790:1.04 
1.47881.47701.4783 1.01 
1.4780 
1.4784 
1.4781 
1.47S3 
L.06 
.98 
1.14 
1.01) 
Variety. 
C.I. 
No. 
Saponification value. 
lodin value. 
Time required to 
dry (days). 
1914 
1915 
1916 
Aver- 
age. 
1914 
1915 
1916 
Aver- 
age. 
1914 
1915 
1916 
Aver- 
age. 
Reserve 
19 
2 
3 
1 
17 
16 
8 
5 
18 
15 
14 
4 
13 
12 
192.1 
192.0 
192.5 
190.8 
192.4 
193.2 
190.9 
193.0 
191.9 
190.8 
193.1 
190.4 
190.2 
191. 9 
. 188. 
191.9 
199.8 
194.6 
189.5 
188.9 
188.3 
186.8 
187.7 
186.7 
186.6 
187.9 
187.0 
186.9 
192.0 
192.0 
189.7 
192.5 
193.0 
193.4 
193.8 
194.9 
194.4 
190.8 
191.7 
192.4 
192.7 
188.6 
190.7 
192.0 
194.0 
192.6 
191.6 
191.8 
191.0 
191.6 
191.3 
189.4 
190.5 
190.2 
190.0 
189.1 
159.3 
165.3 
164.3 
162.5 
.161.4 
156.0 
162.5 
164.3 
162.0 
160.4 
164.0 
159. 
162.4 
161.7 
159.3 
162.7 
160.7 
161.2 
. 166. 6 
163.6 
162.0 
160.5 
161.4 
161.6 
162.7 
159.9 
163.3 
162.4 
166.0 
172.1 
.170.5 
168.5 
164.6 
167.2 
172.1 
166-0 
165.4 
161.7 
166.7 
165.2 
164.1 
164.2 
162.3 
165.5 
. 163. 6 
162.9 
10 
9 
10 
6 
12 
8 
10 
12 
10 
8 
14 
10 
10 
10 
19 
18 
20 
10 
18 
16 
18 
16 
21 
18 
18 
19 
18 
16 
22 
10 
10 
13 
23 
12 
10 
10 
14 
15 
17 
10 
7 
10 
17 
Select Riga (N. Dak. No. 
1214) 
12 
Damont (N. Dak. No. 1215).. 
Select Russian (N. Dak. No. 
608) 
13 
13 
Frontier (N. Dak. No. 155) . . 
N. Dak.No. 1221 
N. Dak. Resistant No. 52 
Stepan (N. Dak. No. 1340)... 
Fargo Common (N. Dak. No. 
1133) 
18 
12 
13 
13 
15 
Idaho Common 
167.5 163.2 
14 
N. Dak. Resistant No. 73 
Kazan (N. Dak. No. 1329) . . . 
N. Dak. Resistant No. 114... 
Primost (Minn. No. 25) 
166.3 
171.9 
164.4 
170.4 
164.3 
163.6 
163.4 
164.8 
16 
13 
12 
12 
PHYSICAL PROPERTIES OF THE OIL. 
The data on the specific gravity of the various samples grown at 
Mandan presented in Table VI show that while there is a slight 
variation between varieties in the same year, these variations are 
not consistent from year to year. Greater variation appears to 
occur between all varieties in different years. Although ordinarily 
it is assumed that high specific gravity is correlated with a high index 
of refraction, high iodin value, and rapid drying qualities, based on a 
comparison of different types of oils, no such correlation is found 
