198 WILDER BROTHERTON, JR., AND H. H. BARTLETT 
Table II 
Length in Mm. of Undivided Primary Cells of Epicotyl of Plant Grown in the Light 
Class 
Section 
Entire 
Internode 
I 
2 
3 
4 
5 
6 
7 
8 
9 
10 
.030-057 
9 
12 
7 
I 
0 
I 
I 
0 
0 
2 
33 
.060-.087 
47 
45 
37 
13 
2 
II 
3 
6 
5 
9 
178 
.090-. 117 
37 
25 
31 
22 
17 
14 
9 
28 
13 
18 
214 
.120-. 147 
7 
17 
21 
19 
12 
II 
II 
6 
14 
5 
123 
.I5O-.I77 
I 
I 
10 
6 
4 
4 
0 
5 
31 
.180-207 
I 
2 
0 
3 
.210-237 
I 
I 
Table III 
Lengths in Mm. of Divided Primary Epidermal Cells of Epicotyl of Plant Grown in Light 
Class 
Section 
Entire 
Internode 
2 
3 
4 
5 
6 
7 
8 
9 
10 
.O9O-.II7 
2 
2 
I 
I 
4 
I 
2 
3 
16 
.120-147 
I 
7 
II 
15 
13 
14 
19 
21 
lOI 
.I5O-.I77 
II 
16 
16 
23 
17 
18 
23 
124 
.180-207 
II 
12 
13 
18 
10 
15 
15 
94 
.210-237 
2 
12 
6 
8 
10 
4 
3 
45 
.240-267 
I 
5 
5 
4 
3 
I 
20 
.270-297 
2 
I 
2 
2 
I 
8 
.300-327 
3 
3 
0 
6 
.330-357 
I 
0 
I 
2 
•360-387 
I 
I 
Table IV 
Length in Mm. of Epidermal Cells Taken at Random, Including Undivided Primary 
Cells and Secondary Cells, from Epicotyl of Plant Grown in Light 
Class 
Section 
Entire 
Internode 
I* 
3 
4 
5 
6 
7 
8 
9 
10 
.003-027 
0 
0 
0 
0 
0 
0 
2 
0 
0 
0 
2 
.O3O-.057 
9 
12 
10 
8 
9 
7 
10 
9 
10 
10 
94 
.060-087 
47 
45 
36 
36 
38 
40 
42 
40 
49 
48 
421 
.090-. 117 
37 
25 
32 
30 
33 
32 
35 
40 
27 
37 
328 
.120-. 147 
7 
17 
21 
15 
14 
16 
10 
II 
12 
5 
128 
.I5O-.I77 
I 
I 
10 
6 
3 
I 
2 
24 
.180-207 
I 
2 
3 
* These sections contained no divided primary cells. 
