438 AMERICAN JOURNAL OF BOTANY [Vol, 8, 
Table 7. Relation of Size of Vein-islets to Age in Leaves of Vitis vulpina L., Vines i and 2 
Number 
of 
Leaves 
Vine 0.8 cm. Diameter 
(5 Annual Rings) 
Vine 5.2 cm. Diameter 
(17 Annual Rings) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
12 
17.4 
.1421 
16.6 
.1389 
Table 8. Relation of Size of Vein-islets to Age in Leaves of Vitis vulpina L., Vines j and 4 
Vine 1.3 cm. Diameter 
Vine 10 cm. Diameter 
Number 
(6 Annual Rings) 
(25 Annual Rings) 
of 
Leaf 
No. Vein-islets 
Area 
No. Vein-islets 
Area 
in Unit Area 
Vein-islets 
in Unit Area 
Vein-islets 
(2.25 sq. cm.) 
(sq. cm.) 
(2.25 sq. cm.) 
(sq. cm.) 
19 
.1184 
20 
.1125 
2 
17 
•1323 
21 
.1071 
3 
18 
.1250 
20 
.1125 
4 
19 
.1184 
18 
.1250 
5 
18 
.1250 
17 
.1323 
6 
17 
.1323 
19 
.1184 
7 
20 
.1125 
16 
.1531 
8 
19 
.1184 
17 
•1323 
9 
20 
.1125 
16 
•1531 
10 
21 
.1071 
20 
.1125 
II 
20 
.1125 
17 
.1323 
12 
17 
.1323 
18 
.1250 
Average 
18.7 
.1205 
18.2 
.1270 
Table 9. Relation of Size of Vein-islets to Age in Leaves of Vitis vulpina L., Vines 5 and 6 
Number 
of 
Leaves 
Vine 1.3 cm. Diameter 
(6 Annual Rings) 
Vine 5.2 cm. Diameter 
(17 Annual Rings) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
10 
13 
.1740 
16.6 
.1389 
Table 10. Relation of Size of Vein-islets to Age in Leaves of Vitis vulpina L., Vines 7 and 12 
Number 
of 
Leaves 
Vine 3 cm. Diameter 
(12 Annual Rings) 
Vine 6.4 cm. Diameter 
(18 Annual Rings) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
No. Vein-islets 
in Unit Area 
(2.25 sq. mm.) 
Area 
Vein-islets 
(sq. mm.) 
10 
21.8 
.1054 
18.9 
.1192 
