378 MR. G. F. SCOTT ELLIOT ON THE EFFECT OF 
only two cases where the shade-form has relatively broader leaves 
than the sun-form. In Psiadia this difference is perceptible, but 
in the other case, Lycium, the difference is only that between 
1:93 and 1:92. Three other cases show a scarcely measurable 
difference, but, on the whole, the relatively longer and narrower 
Tasir III. 
Leaf-proportion in various Plants. 
| | RUM 
[^ ea of Length | Breadth) Leaf- | 
Saa of leaf. | of leaf. | ratio. 
| measured. | 
So ee LEE UU MEA ROM Le 
Microrhynchus sarmentosus ...| A | 100 | 404 DO 6:85 
os å IBE 100 | 15 52 4:69 
Lobelia Scevola..................] AL 100 | 778 3:49 2:22 
A d oues. | Bi Wo | 327 21 1:56 
Psiadia dodonæfolia ............ | Ai 100 | 3°89 58 10°21 
" DL e E B | 100 1:82 16 11:38 | 
Helichrysum emirnense...... VA | 100 | 94 1 9:4 | 
x ur NE | B 100 | 45 0s | 563 | 
Spermacoce globosa... ....... A 100 — 127 21 | 604 | 
E Boc eu B 100 | '68 16 1425 
Lycium capense, Mill. ........ E Id c T 38 | 192 | 
". een BT 52 Hj 
Breæia madagascariensis ......| AI BO 1445 29:55 | 170 | 
» à) 7. ut B 50 | 397 2-12 154 | 
Camptocarpus, SD JTA] 100 | 1°24 3 | 415 
| wu nl. IB | 100 |- 1:9] 34 | 356 
Periploca ovata, Deene. | | 100 11:17 a 0 16 
” DR NE 3 100 99 62 | 149 
Commelina nodiflora............ Al 100 2°24 69 | 325 
| ar TE B| 100 123 42 | 293 
| Tanghinia venenifera ......... AT HU | CMM 154 | 474 
” So eo UR DA QUE 3 | 100 | 36 1 5 | 301 
Brachystephanus cuspidatus A 30 | 431 2:56 T1 
Pur 5 ER | 50 2:46 i145 | 17 
| Mona sp: ve. A | 50 | 2-93 147 | 199 
pos Ad uu Br 5o | 247 137 | 18 
| Sida carpinifolia |............... A 100 | 375 | LOF | 257 
E n m B 50 | i6 | 76 | 2H 
| Finca rosea «GS A 50 | 9-49 | 1:09 2:28 
P s HE B 50 | 189 -83 2:28 
i \ | 3 — 
form of the shade-leaves is very obvious; the average difference 
in the leaf-ratio in favour of the shade-leaves taken from the 
whole fifteen cases being as much as 62. 
The leaves of climbing and prostrate plants (at least those 
which are petiolate) show another peculiarity, which comes out 
clearly in Table IV. It consists in the leaves of those fully 
