Dec. io, 1917 
Flaxwilt 
597 
from a number of individuals are mixed. This was what actually hap¬ 
pened. In the second generation there was great variation in the prog¬ 
eny from individuals of this first generation (PI. 46, B, c, h ). This is 
what might be expected, since the chances are that each group of second- 
generation plants came from a different cross. This method of growing 
the progeny was found to be very unsatisfactory as it gave no direct line 
on individual crosses which have been found to behave so differently. 
Table) VI .—Resistance to flaxwilt of the progeny from crosses between resistant and sus¬ 
ceptible strains of flax in which about an equal number of resistant and susceptible 
plants occurred in the first generation 
RESISTANT NO. 4 9 X SUSCEPTIBLE NO. 6 (f 
Parent strain. 
Date of 
Num¬ 
ber of 
Ratio at end of 
' three weeks. 
Ratio at end of 
experiment. 
Num¬ 
ber of 
plants 
planting. 
plants 
grown. 
Wilted. 
Not 
wilted. 
Wilted. 
Resist¬ 
ant. 
killed 
by 
wilt. 
4E2 (F,). 
1916 
Apr. 25 
...do. 
6 
I 
K 
2 
2 
I 
Resistant No. 4. 
6 
0 
O 
6 
0 
0 
0 
6 
0 
Susceptible No. 6. 
...do. 
0 
O 
0 
Q 
0 
Q 
7 
7 
7 
7 
F 2 generation: 
4E2-1. 
Sept. 23 
...do. 
26 
8 
18 
15 
24 
11 
14 
21 
4E2-2. 
37 
17 
20 
13 
*T ***** ****** .*... 
Total. 
<53 
25 
38 
39 
24 
35 
Resistant No. 4. 
Sept. 23 
...do. 
26 
4 
22 
7 
19 
0 
c 
Susceptible No, 3. 
24 
14 
10 
24 
0 
24 
RESISTANT NO. 4 9 X SUSCEPTIBLE NO. 3 <? 
4D3 (Fi). 
1916 
Feb. 2 
18 
0 
l8 
10 
8 
2 
Resistant No. 4. 
.. .do. 
17 
16 
0 
17 
14 
0 
17 
0 
0* 
Susceptible No. 3.. 
., .do. 
2 
16 
11 
F 2 generation: 
4D2-1..... 
July 21 
74 
63 
105 
47 
43 
69 
27 
20 
73 
61 
1 
53 
46 
82 
4D2-2. 
2 
D2—2 . . . .. 
,. .do. 
36 
103 
2 
Total. 
242 
159 
83 
*37 
5 
i8r 
Resistant No. 4. 
July 21 
...do. 
37 
26 
6 
31 
1 
14 
26 
23 
0 
8 
Susceptible No. 3. 
25 
26 
RESISTANT NO. 
4 d AND SUSCEPTIBLE NO. 3 
$ 
3E22 (F,).. 
1916 
July 21 
...do. 
0 
1 
8 
A 
5 
15 
0 
3 
0 
Resistant No. 4. 
y 
ic 
0 
15 
2 
0 
Susceptible No. 3. 
.. .do. 
18 
16 
l8 
18 
F 2 generation: 
2E22—2... 
Sept. 23 
...do. 
24 
26 
20 
A 
23 
7 
24 
1 
22 
Resistant No. 4. 
A 
*T 
22 
19 
0 
5 
24 
Susceptible No. 3. 
...do. 
24 
*T 
14 
10 
