NO.    6  GROWTH    OF    AVENA    COLEOPTILE JOHNSTON  5 
Table  i. — Data  Showing  Average  Length  (nun)  of  First  Intcrnodc,  Colcoptilc, 
and  Total  Oat  Seedling  (Avena  sativa  var.  Markton)  After  Four  Days' 
Grozvth  in  Light  and  in  Darkness  at  the  Indicated  Maxiimnn  and  Miniinwn 
Temperature  (°  F.) 
Exposed  series 
Dark  series 
Tempt 
Max. 
Wave 
length 
A 
First 
inter- 
node 
Coleop- 
tile 
Total 
First 
inter- 
node 
Coleop- 
tile 
Total 
;rature 
Min. 
4050 
30 
30 
60 
75 
10 
85 
77 
76 
30 
29 
59 
47 
6. 
53 
79 
77 
4265 
31 
30 
61 
51 
6 
57 
79 
77 
29 
26 
55 
65 
9 
74 
78 
78 
4405 
29 
23 
52 
59 
6 
65 
76 
75 
30 
27 
57 
34 
6 
40 
76 
75 
4595 
24 
24 
48 
64 
8 
72 
78 
77 
27 
22 
49 
55 
8 
63 
76 
76 
4798 
30 
21 
51 
59 
7 
66 
76 
75 
27 
25 
52 
54 
II 
65 
88 
88 
5005 
30 
24 
54 
59 
II 
70 
73 
72 
30 
28 
58 
61 
9 
70 
73 
72 
5195 
3^ 
26 
58 
55 
9 
64 
74 
72 
29 
31 
60 
60 
12 
72 
75 
72 
25 
30 
55 
56 
10 
66 
74 
73 
5403 
28 
30 
58 
56 
II 
67 
73 
72 
30 
31 
61 
57 
18 
75 
74 
73 
23 
22 
45 
42 
II 
53 
72 
71 
5605 
22 
22 
44 
37 
9 
46 
73 
72 
19 
19 
38 
40 
10 
50 
74 
72 
5795 
22 
26 
48 
46 
15 
61 
74 
73 
19 
28 
47 
39 
15 
54 
74 
72 
5990 
17 
23 
40 
44 
14 
58 
74 
72 
21 
27 
48 
43 
18 
61 
74 
72 
6200 
18 
20 
38 
35 
12 
47 
74 
73 
15 
23 
38 
43 
16 
59 
64 
62 
^'395 
16 
29 
45 
42 
16  . 
58 
75 
72 
19 
34 
53 
39 
19 
58. 
75 
73 
f)595 
15 
27 
42 
33 
17 
50 
74 
72 
17 
31 
48 
33 
14 
47 
75 
73 
6800 
24 
35 
59 
40 
20 
60 
76 
74 
20 
38 
58 
38 
23 
61 
74 
72 
7005 
24 
34 
58 
3<' 
19 
55 
75 
74 
25 
32 
57 
35 
16 
51 
76 
75 
7600 
33 
28 
Ci 
41 
7 
48 
76 
74 
32 
25 
57 
51 
9 
60 
78 
74 
