296 



Harris M. Benedict 



TABLE 2. Area of Vein Ism;ts in Leaves of Different Sizes from Vitis Vines 



WITH FROM Se^TN TO ElE^^EN RiNGS 



Number of leaf 



Area of leaf 



(square 

 centimeters) 



Area of vein 



islets 



(square 



millimeters) 



1 



73 



77 

 85 

 92 

 96 

 101 

 105 

 109 

 112 

 116 

 123 

 126 

 131 

 137 

 142 

 147 

 178 

 190 

 250 



0.35S0 



2 



0.3691 



3 



3694 



4 



0.3814 



5 



0.3761 



6 



0.3818 



7 



0.3812 



8 



3207 



9 



0.3669 



10 



0.3612 



11 .- 



3391 



12 



3186 



13 



3217 



14 



3716 



15 



3197 



16 



3263 



17 



3703 



18 



3663 



19 



0.3777 







growing several thick water sprouts. The relative size of the huge 

 leaves growing on the water shoots and on the small tree was determined, 

 as well as the size of the vein islets, with the following results: 



Smaller tree . . . 

 Water sprouts. 



Area of leaf 

 (square centimeters) 



30 



1,560 



Area of vein islets 

 (square centimeters) 



0.04 



0.02 



The larger leaves had the smaller vein islets. The marked decrease 

 in size of the vein islets is due to age. Similar results have been obtained 

 from leaves borne on water sprouts of other varieties of trees. 



Influence of thickness of leaf on size of vein islets 



While very great differences in thickness of the leaves were not expected 

 to occur, it seemed necessaiy to determine whether this factor might 



