60 


| (This leaf had been de- 
Dr. H. T. Brown and Mr. F. Escombe. 
[Jan. 9, 
Table [X.—Test of Symmetry between Opposite Sides of Leaves. 
R. = Right half. 
Area in 
square 
centimetres. 
Name of plant. 


Catalpa bignonioides ...... 
ecevcevoe 
pleted by covering) | 
Catalpa bignomoides...... 
Catalpa purpurea 
Catalpa Bunget............ 
39 23 
‘ropeolum majus 
oe 
Polygonum Weyrichit ... 
Ne) 
Oo 
Ore WOoOnwown qn are 











L. = Left half. 
Dry weight | 
Dry weight | per square | Difference, 
in grammes.| decimetre | per cent. aos 
in grammes. 
0-°4652 0:4069 
0° 3906 0-3909 —3°9 
0°8482 0°5153 
07680 0-4929 —4°3 
0°6024 0°4752 
0°6386 0°4864 +2°3 
0°4211 0°3761 
0° 3685 0°3546 —5°7 
0:°4983 0°4644 
0:°4994 0°4610 —0°7 
0°4526 0-°5079 
0°4716 0°5184 +2°0 
0°6261 0°5560 
0°6472 0°5637 +1°3 
0-6504 0-5855 
0°5533 0°5751 sleet 
0°1754 0° 3732 
0-1624 0°3746 +0°3 
0°9124 0°5270 
0-9252 0-5209 -0°1 
Mean error.. +22 7 


Table X.—Influence of Exposure of Leaves in altering Area. 






Area before | Area after Difference 
Fale lest insolation in insolation in| per cent. 
square square induced by 
centimetres. centimetres. | insolation. ; 
(1) Catalpa bignomoides .. ......... 112-2 108°7 —3:12 
(2) ‘3 PME P85, 19 113°0 +0°98 
(3) : Lt eee 138°4 138-9 +0°36 
(4) ,, BLE ab arate aaa 1304 137 °3 +0°14 
Mean...... fala 


