126 
AMERICAN JOURNAL OF BOTANY 
[Vol. 9. 
Table 2. Measurements in Cross Section of Epidermal Root Cells of Cuttings of Trees of 
Salix nigra, Group B 
Ave. Measure, 
Number ot Tree Diameter of Tree 5 Cells 
(Inches) (Microns) 
58 4 14.24 X 9.25 
62 4 8.95x10.95 
68 4 10.95x15.93 
167 4I 11.78 X 10.29 
330 5^ 11.78 X 12.28 
405 4 12.69 X 14.60 
601 6 10.95 X 11.62 
609 4 11.95 X 11.62 
612 5 9.79 X 13. II 
617 4 8.30 X 12.94 
621 5 , 11.28 X 13.92 
623 6 9.62 X 12.28 
627 6 10.45 X 10.95 
633 4 11.28 X 14.27 
635 5 12.28x16.93 
639 4 8.30x10.62 
641 6 11.62 X 17.92 
642 5 12.61 X 13.77 
700 5 11.62 X 15.27 
706 6 13.94x16.93 
Average 11.21 x 13.27 
Table 3. Measurements in Cross Section of Epidermal Root Cells of Cuttings of Trees of 
Salix nigra, Group C 
Ave. Measure, 
Number of Tree Diameter of Tree 5 Cells 
(Inches) (Microns) 
35 10+ 13.41 x 11.95 
44 10 9.62x13.94 
46 18 12.57x16.50 
48 10 11.96 X 12.28 
151 12 11.62 X 14.92 
326 13 10.06x15.75 
327 13 9.62x10.55 
328 13 11.41X 14.94 
400 10+ 10.29 X 14.81 
404 15 7.97x10.61 
600 8-10 9.62x13.55 
602 20 10.46 X 13.61 
604 10 13.12 X 15.07 
605 8 9.13x10.62 
611 8 10.65x10.79 
620 8 12.28 X 15.27 
624 10+ 9-63 X 9.63 
625 10+ 9.92 X 11.79 
628 8 10.13 X 11.62 
629 8 9.79 X 11.29 
630 10 11-95 X 10.27 
631 8-10 11.45 X 12.96 
632 10+ 12.55x13. II 
• 634. 10 9.62 X 13.28 
643 10 10.79x14.94 
702 10+ 10.29 X 14.61 
703 10+ 14.44 X 11.79 
704 10+ 11.79 X 13.45 • » 
705 10+ 13.44 X 15.10 
708 8 11.62 X 15.27 
Average 
10.04 X 13-14 
