12 
BULLETIN 1289, U. S. DEPARTMENT OF AGRICULTURE 
Table 4. — Tests of Oregon vetch seed made in October of stated years, shoicing years 
of growth and periods of germination 
[Results in percentages] 
,_, 
03 
s 
O 
Is 
a 
1 
to 
a 
1916 
19 
7 
1918 
1919 
1920 
1921 
1922 
1923 
Year grown 
d 
d 
a 
© 
c 
■d 
§ 
03 
03 
w 
a 
d 
© 
T3 
8 
1/3 
T3 
d 
o 
i 
u 
© 
© 
© 
S3 
03 
W 
d 
_o 
ta 
a 
| 
© 
C 
T3 
8 
in 
X} 
03 
w 

el 
d 
© 
T3 
© 
© 
W 
d 
o 
"c3 
d 
© 
■d 
c3 
H 
d 
_o 
"S 
d 
1 
© 
© 
© 
03 
w 
d 
o 
"c3 
© 
"3 
© 
CO 
03 
w 
1914-15 
1.21 
21 
Ls 
la 
{10 
3 
ho 
121 
1 3 
10 
121 
f 3 
•10 
121 
f 3 
ho 
121 
92 
98 
98 
83 
98 
99 
8 
2 
2 
17 
2 
1 
97 
99 
100 
88 
96 
97 
92 
97 
97 
3 
1 

12 
4 
2 
8 
3 
3 
95 
99 
99 
96 
100 
100 
95 
99 
100 
5 


4 


5 
1 

94 
100 
100 
92 
99 
100 
98 
100 
100 
89 
100 
100 
"" " 
6 


8 
1 

2 


11 


94 
100 
100 
98 
100 
100 
97 
98 
98 
92 
95 
96 
98 
100 
100 
6 


2 


3 
2 
2 
8 
4 
4 
2 


95 
99 
99 
97 
100 
100 
95 
100 
100 
94 
99 
100 
96 
100 
100 
97 
100 
100 
5 
1 
1 
3 


5 


6 
1 

4 


3 


94 
99 
97 
97 
100 
100 
98 
100 
100 
95 
100 
100 
95 
100 
100 
96 
99 
99 
96 
100 
100 
5 


3 


2 


5 


5 


4 
1 
1 
4 


93 
96 
96 
90 
93 
93 
96 
96 
96 
97 
100 
100 
94 
98 
98 
93 
99 
99 
95 
100 
100 
94 
100 
100 
5 
?, 
1915-16- _ - 
2 
3 
n 

9 
1916-17 
?, 
?, 
3 
1918-19-. -- 
_ | 


6 
1919-20 
"/"I™ * 
?, 
?, 
7 
1920-21 


5 
1921-22 
1--- 


6 
1922-23 


_„ T - 
1 
THE RELATION OF TRIPPING TO SEED SETTING 
To determine whether or not tripping the flowers of different 
varieties of vetch is beneficial or essential to seed setting, plants were 
Fig. 4.— Tarlatan cages used in pollination studies 
covered by tarlatan net cages just as they were coming into bloom 
(fig. 4). The pods forming from tripped flowers were compared with 
those from untripped flowers. Flowers in tight paper bags were also 
