130 
AMERICAN JOURNAL OF BOTANY 
[Vol. 9, 
Table 12. Measurements in Longitudinal Section of Cortical Root Cells of Cuttings of Trees 
of Salix nigra, Group C 
Ave. Measure, * 
Number of Tree Diameter of Tree 5 Cells w 
(Inches) (Microns) I 
46 18 ^ 48.14 X 9.62 1 
48 10 56.44 X 14.27 i 
91 8-10 81.65x18.60 I 
154 15 66.40x20.91 I 
600 8-10 70.71x20.58 * 
702 10+ 117.86x23.24 'I 
703 10+ 108.73x21.58 ■% 
704 10+ 112.88 X 17.60 I 
Average 82.85x18.30 
Table 13. Measurements in Cross Section of Endodermal Root Cells of Cuttings of Trees of 
Salix nigra, Group A 
Ave. Measure, 
Number of Tree 
76 
306 
308 
318 
321 
343 
357 
364 
608 
636 
637 
640 
710 
713 
714 
715 
716 
719 
724 
733 
735 
737 
746 
Average . 
Table 14. Measurements in Cross Section of E?idodermal 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 9-96 X 7.12 ; 
62 4 1 1.29 x 9.29 * 
68 4 9.96x12.28 j 
167 4I 9-79 X 8.96 I 
330 5 8.63 X 9.29 I 
405 4 II. 12 X 10.62 j 
601 6 11.95 X 9.62 I 
609 4 8.96 X 7.96 S 
612 5 9.29 X 8.30 i 
617 4 8.50 X 7.96 . 
621 5 9.29 X 9.29 I 
623 6 11.95 X 8.30 ■ I 
627 6 11.95 X 6.97 I 
633 4 9.59x10.19 i 
635 5 8.16x10.95 I 
639 4 II.I2X 8.46 j 
641 6 10.95 X 8.63 j 
700 5 10.95 X 11.28 ; 
706 6 12.61 X 6.38 I 
Average 10.31 x 9.04 j 
Diameter of Tree 
(Inches) 
5 Cells 
(Microns) 
1 
4 
15.93 X 10.29 
3 
T6 
10.95 X 11.48 
1 
8 
8.30 X 9.29 
_3_ 
16 
10.27 X 8.96 
3 
16 
11.62 X 9.62 
10.95 X 7-96 
15.47 X 8.30 
14.27 X 11.62 
9.96 X 8.46 
1 
2 
9.96 X 10.95 
12.95 X 11.62 
10.62 X 8.13 
9.09 X 8.63 
12.77 X 8.96 
1 
2 
12. II X 8.96 
10.95 X 8.13 
10.79 X 9.62 
1 
2 
11.62 X 9.62 
10.95 X 8.63 
11.62 X 10.29 
10.12 X 10.62 
9.96 X 6.37 
9.98 X 8.13 
11.31 X 9-33 
