598 
Journal of Agricultural Research 
Vol. XI, No. ii 
A number of cases were discovered in which the first generation split 
up into almost equal numbers of resistant and susceptible plants, but 
there seemed to be no definite order of segregation in the second genera¬ 
tion in cases of this kind. The severeness of conditions under which 
these plants were grown can be judged from the controls in each case. 
Table VI gives results of crosses of this kind. 
Another grouping of tables has been made to show the results of 
crosses where there was a larger number of resistant than susceptible 
plants in the first generation. There seems to be but little relation 
between the behavior of the first and second generations from these 
crosses. Table VII gives the results of crosses of this kind. 
Table VII .—Resistance to flaxwilt of crosses between resistant and susceptible strains of 
flax in which a greater number of resistant than susceptible plants occurred in the first 
generation 
RESISTANT NO. 4 9 X SUSCEPTIBLE NO. 3 c? 
Parent strain. 
Date of 
planting. 
Num¬ 
ber of 
plants 
grown. 
Ratio at end of 
three weeks. 
Ratio at end of 
experiment. 
Num¬ 
ber of 
plants 
killed 
wiL 
Wilted. 
Not 
wilted. 
Wilted. 
Resist¬ 
ant. 
dDif'F,’) . 
1916. 
Mar. 29 
.. .do. 
21 
95 
85 
4 
80 
17 
90 
5 
4 
35 
17 
«7 
0 
2 
*6 
_ 35 
'Resistant No. a . 
Siicrpn+ihlp No 1 . 
., ,do. 
F 2 generation: 
4D1— 2 . 
July 22 
.. .do. 
47 
49 
4i 
32 
47 
49 
32 
41 
35 
24 
35 
45 
15 
8 
6 
8 
12 
4 
42 
47 
37 
28 
43 
47 
5 
2 
4 
4 
4 
2 
36 
42 
34 
24 
36 
42 
/iT)t —a . 
., .do . 
xT)t— e . 
. . .do . 
. 
. . .do . 
8 1 ti. 
. . .do . 
Total. 
265 
212 
53 
244 
21 
214 
’RAcictant No a . 
.. .do. 
55 
47 
12 
45 
43 
2 
37 
47 
18 
0 
15 
46 
Siicppntihlp Nn 1 . 
...do. 
\JUO\rVU LA UIV AW* O •••*•**•• 
RESISTANT NO. 4 $ X SUSCEPTIBLE NO. 5 $ 
5Ei(F), .. 
'Dpeictatit Nn a . 
Feb. 2 
.. .do . 
8 
18 
0 
0 
8 
18 
2 
0 
6 
18 
0 
0 
.Qiicppn+ihlp Nn C . 
.. .do . 
16 
2 
14 
16 
0 
16 
F 2 generation: 
cKi— 1 .. 
Sejrt. 23 
73 
S 6 
22 
67 
11 
5 1 
cF,T”? ,,. 
8 
2 
6 
4 
4 
4 
O'*-*- 1 - *. 
. . .do . 
18 
8 
10 
18 
0 
15 
5^J A .. 
a .. 
. . .do . 
24 
14 
10 
21 
3 
18 
». 
20 
7 
13 
13 
7 
10 
Total . 
133 
37 
5 i 
123 
25 
98 
Resistant No. 4 . 
26 
4 
22 
7 
19 
5 
Susceptible No. 5 . 
2 
2 
0 
2 
0 
2 
