Senile Changes in Leaves of Certain Plants 307 



TABLE 14. Area of Vein Islets in Leaves of Vines 17 and 18 



Number of leaf 



Length 



(centimeters) 



Breadth ' / 



(centimeters) ," , n 

 ^ ' centimeters) 



Area of 



islets 



(square 



millimeters) 



Vine 17, 1.3 centimeters in diameter, 5 annual rings (only eight leaves picked) 



12 



11 



90 



0.9 



0.4863 



12 



12 



100 



1.1 



0.5017 



12 



10 



78 



0.9 



0.4096 



12 



13 



104 



1.1 



0.5023 



12 



10 



80 



0.9 



0.5085 



11 



12 



85 



0.9 



0.4893 



10 



10 



75 



0.8 



0.4971 



11 



10 



75 



0.9 



0.4813 



1. 



2. 

 3. 



4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



Vine 18, 10.1 

 14 

 14 

 15 

 14 

 13 

 13 

 11 

 12 

 11 

 10 



centimeters in diameter, 35 annual rings 



15 150 1.7 



13 130 1.4 



14 135 1.5 

 14 125 1.4 



13 115 1.3 



12 110 .1.2 



14 110 1.3 

 11 90 1.0 



13 100 1.1 

 13 90 1.0 



0.2417 

 0.2378 

 0.2363 

 0.2419 

 . 2263 

 0.2511 

 0.2387 

 0.2267 

 0.2239 

 0.2106 



Average area of islets for vine with 5 rings . 4845 square millimeter 



Average area of islets for vine with 35 rings . 2335 square miUimeter 



TABLE 15. Area of Vein Islets in Leaves of Vines 19 and 20 



Number of leaf 



Length 



(centimeters) 



Breadth 



(centimeters) 



Area 



(square 



centimeters) 



Weight 

 (grams) 



Area of 



islets 



(square 



millimeters) 



Vine 19, 1.5 centimeters in diameter, 5 annual rings 



1. 

 2. 

 3. 

 4. 

 5. 

 6. 

 7. 

 8. 

 9. 

 10. 



15 



13 



110 



1.2 



0.5410 



13 



12 



105 



1.1 



0.5363 



14 



13 



140 



1.6 



0.4597 



13 



12 



115 



1.2 



0.4817 



15 



13 



135 



1.6 



0.4861 



16 



15 



170 



1.9 



0.4877 



14 



13 



125 



1.4 



0.5437 



13 



13 



120 



1.4 



0.5019 



12 



12 



105 



1.3 



0.5115 



11 



12 



100 



1.2 



0.5061 



