318 
M. R. ENSIGN 
• width. The long diameter, i.e., parallel with the mid-rib, was usually two 
times the short diameter. The results are given in table 4. The table 
shows that the size of the vein-islets in these leaves is quite constant irre- 
spective of the great differences in the size of the leaves. 
Fig. 2. Photomicrograph showing the venation in a mature healthy leaf of C. grandis 
measuring 68 mm. in diameter. X 30. 
Table 4. Influence of size of leaves upon size of vein-islets in leaves of Citrus grandis 
Size of Leaf (Mm.), 
No. of Vein-islets in 4 
Size of Vein- 
islets in Mm. 
Leaf No. 
Short Diameter 
Sq. Mm, of Leaf Surface 
Small 
Large 
Small 
Large 
Small 
Large 
I 
20 
40 
.1.5 
10.7 
.3405 
.3740 
2 
25 
38 
10 
10 
.4000 
.4000 
3 
12 
40 
9.2 
II 
.4460 
.3666 
4 
22 
42 
II. 2 
13.2 
•3530 
.3040 
5 
27 
33 
9.2 
II. 7 
.4460 
.3400 
^ 
13 
35 
II. 2 
14 
.3530 
.2894 
7 
16 
40 
12.7 
9.2 
•3199 
.4460 
8 
20 
40 
II-5 
9-7 
•3499 
.4267 
9 
18 
47 
II. 7 
10.7 
.3405 
•3740 
10 
15 
40 
10.5 
10.7 
.3800 
•3740 
Average 
18.8 
39-5 
10.87 
11.09 
.3728 
•3694 
Mean average for 25 leaves. . 
17 
45 
10.7 
.3740 
.3666 
