jd 4 indicate the position of the mid-rib. 
i;r 
(4) 
tees between ribs measured on transverse 
sections of leaf. 
(5) 
Average 
total 
breadth 
of ribs 
(sections). 
(6) 
Depth of 
mid- rib. 
( 7 ) 
Depth 
at 
Sinus. 
(8) ( 9 ) 
Mean sectional 
area of chloro- 
phyll tissue per 
mm. of breadth. 
2-3 
3-4 
4-5 
5-6 
6-7 
No. 7 to 
margin. 
Total p. 
423 
188 
1241 
237 
260 
150 
IIO 
88,990 
1 
455 
435 
423 
324 
2300 
224 
325 
x 52 
238 
214,200 
423 
429 
422 
140 
2083 
224 
260 
130 
195 
174,030 
3 
337 
337 
345 
162 
1720 
198 
260 
127 
x 93 
171,770 
461 
448 
442 
241 
2314 
300 
325 
151 
238 
207,060 
325 
325 
325 
195 
1710 
210 
293 
146 
219 
192,063 
l 
305 
3 XX 
305 
182 
1584 
218 
260 
xx 7 
188 
x 55 5 358 
409 
390 
390 
260 
2184 
236 
342 
x 33 
237 
201,190 
♦; 
423 
468 
455 
253 
2294 
243 
293 
IOI 
x 97 
X 76 , 3 X 5 
f 
520 
520 
520 
507 
338 
182 
3192 
410 
325 
x 47 
236 
205,685 
3: 
305 
325 
325 
195 
1670 
192 
214 
120 
203 
1 79>655 
2i 
312 
325 
338 
292 
260 
130 
2067 
333 
188 
100 
144 
120,808 
3! 
39 ° 
403 
39 ° 
39 ° 
325 
162 
2606 
327 
260 
149 
204 
178,402 
3! 
37i 1 
345 
384 
262 
2059 
249 
288 
120 
204 
x 79,3 x 6 
3' 
350 
160 
1035 
134 
224 
109 
166 
144,420 
l- 
439 
198 
1263 
147 
268 
122 
x 95 
172,303 
3! 
37i 
192 
Ix 45 
x 34 
262 
96 
1 79 
x 55,857 
3< 
312 
306 
312 
195 
1697 
269 
273 
162 
217 
182,497 
