March, 1922I 
TELLEFSEN RELATION OF AGE TO SIZE 
127 
Table 4. Measurements in Longitudinal Section o f Epidermal Root Cells of Cuttings of Trees 
of Salix nigra, Group A 
Ave. Measure, 
Number of Tree Diameter of Tree 5 Cells 
(Inches) (Microns) 
76 J 74.70x11.28 
302 1^ 114.87 X 8.63 
308 I 58.10 X 9.96 
707 2 82.21 X 12.95 
710 I 124.25 X 13.28 
713 I 68.06x10.95 
714 I2 7945 X 8.68 
715 2 101.92 X 11.28 
716 I 75.03x11.95 
717 2 108.23 X 10.12 
719 91.96 X 9.96 
733 I 93.62x13.28 
746 I 86.20 X 8.30 
Average 89.12 x 10.81 
Table 5. Measurements in Longitudinal Section of Epidermal Root Cells of Cuttings of Trees 
of Salix nigra, Group B 
Ave. Measure, 
Number of Tree Diam.eter of Tree 5 Cells 
(Inches) (Microns) 
58 4 63.36x10.72 
62 4 5544 X 8.30 
68 4 91.63x13.94 
Average 70.14X 10.98 
Table 6. Measurements in Longitudinal 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) 
46 18 75-36 X 9.29 
48 10 37-85 X 8.63 
91 8-10 44.08 X 14.60 
600 8-10 74.70 X 9.96 
702 10+ 101.26 X 10.63 
703 10+ 83.83x12.45 
704 10+ 109.56 X 9.63 
729 10+ 93.50x15.94 
Average 77-51 x 11.39 
