128 
AMERICAN JOURNAL OF BOTANY 
{Vol. 9, 
Table 7. Measurements in Cross Section of Cortical Root Cells of Cuttings of Trees of 
Salix nigra, Group A 
Ave. Measure, 
Number of Tree 
Diameter of Tree 
5 Cells 
(Inches) 
(Microns) 
70 
1 
or^ Cxi V 0 /I 
6^^ 
z / .04 X 
_3_ 
16 
1 
s;7 X '2K 8q 
v5^° 
3 
16 
07 C C V "70 7 T 
1? T 
3 
22 2/1 V 21 on 
1 1 0 
— J 
28 88 X 27 88 
1 1 1 
— J 
of, 22 X ''2 C7 
6d/ 
— J 
27 88 X 26 OT 
— I 
29.21 X 22.90 
606 
2 
21 2/1 X22 C7 
608 
2 
616 
2 
2 'I ^fS X 2<S 8q 
6^6 
I* 
7.1 2T X 2Q 2T 
"J/ 
2 
ifS 02 X 17 82 
2 
1 2 20 Y 1 T i A 
640 
I 
40,16 X 36.18 
707 
2 
24.90 X 23.86 
770 
J 
28 ^ ^ X 20 2 T 
7 T 
I 
18 X 17 
714 
I| 
36.54 X 41.16 
715 
2 
32.87 X 33.99 
716 
I 
27.72 X 33.86 
717 
2 
30.54x27.68 
719 
ih 
28.22 X 33.53 
720 
ii-2 
24.90 X 28.81 
724 
2 
32.87 X 34.86 
733 
I 
35.85 X 38.84 
734 
I 
33.86x35.52 
735 
2 
31.87 X 34.19 
737 
I 
31.87x33.86 
746 
I 
31.54x40.17 
Average 
29.57 X 30.02 
Table 8. Measurements in Cross Section of Cortical Root Cells of Cuttings of Trees of 
Salix nigra, Group B 
Ave. Measure, 
Number of Tree 
Diameter of Tree 
5 Cells 
(Inches) 
(Microns) 
58 
4 
16.42 X 18.58 
62 
4 
26.56 X 28.22 
68 
4 
21.58 X 25.56 
167 
4i 
29.71 X 22.72 
330 
5 
24.23 X 29.21 
405 
4 
26.89 X 24.56 
601 
6 
34.19x31.20 
609 
4 
29.54x29.54 
612 
5 
33.86x30.71 
617 
4 
26.56 x 24.07 
621 
5 
33.53 X 29.55 
623 
6 
28.67 X 29.38 
627 
6 
30.54x32.53 
633 
4 
36.85x38.78 
635 
5 
33-53 X 36.52 
639 
4 
29.05 X 27.37 
641 
6 
28.88x33.53 
642 
5 
31.91 X 30.87 
700 
5 
32.03 X 33.03 
706 
6 
30.87 X 30.87 
Average 
29.92 X 29.36 
