Senile Changes in Leaves of Certain Plants 



321 



TABLE 30 {concluded) 



Number of leaf 



Length 



(centimeters) 



Breadth 



(centimeters) 



Area of 



islets 



(square 



millimeters) 



Vine 6, 4.5 centimeters in diameter {concluded) 



9 



10 



11 

 13 



16 

 14 



115 

 135 



1.8 

 0.8 



0.3763 

 0.3705 



Average area of islets for vine 20.4 centimeters in diameter 0.3130 square millimeter 



Average area of islets for vine 4.5 centimeters in diameter 0. 3740 square millimeter 



TABLE 31. Summary of Data for Vitis bi color Le Contb 



Diameter of vine (in centimeters) 



2.5 



3.8 



4.5 



15.3 



20 4 



25.5 



Size of islets (in square millimeters) 



0.4743 



0.3926 



0.3740 



0.3057 



0.3130 



2312 



This species is characterized by larger vein islets than those of Vitis 

 vulpina, but exhibits the same age- venation relationship. 



Size of vein islets in Tecoma radicans L. 

 The vines of Tecofna radicans examined were growing in a private yard. 

 Those that were 20.4 centimeters in diameter had been planted, and the 

 smaller ones had come up from their seeds. The size of islets given is the 

 average for ten leaves of each plant. Here again the vines were not cut 

 and the age must be inferred from the diameter of the stem. 



TABLE 32. Area of Vein Islets in Tecoma radicans 





Diameter of stem 





1.3 centimeters 



3.8 centimeters 



20.4 centimeters 





Square 

 millimeters 

 1.5 

 1.4 

 1.5 

 1.6 



Square 

 millimeters 

 0.95 

 0.97 

 0.94 

 0.98 

 0.96 



Square 

 millimeters 

 0.62 

 0.63 

 0.68 

 0.70 

 0.67 



Average 



1.5 



0.96 



0.66 



