213 
than a relatively high pressure over a correspondingly smal- 
ler area. 
Strychnos laurina, Wall, After 1 month. 
Coils. S—S A—P 
a to ~ rod 0.5cm. diameter, weak strain. aes L 141.165 
un 0.7 ” " 2/5 198.155 
“Ee of GC eiel Cu wire pressing sion convex sia 3/, 132.157 
Attached to stem 0.5 cm. diam. rh . aie 1'/, 365 .375 
n WEA ; ” 1'/, 430. 420 
Loop of string, 2.3 mm. diam., 0.25 ee gar Slight pressure on alisides 1'/, 190.200 
Loose twig, 2.5 mm. diam., 0.3 grm. weight suspended in hoo 14%, 175.195 
Untouched 5/, 120.135 
Loop of string 1.5 mm. diam. attached. Pull of 1 gramme 140.170 
Feo a eS h a 209 . 214 
Pet eee oe 7] n »&  m» At point of contact 310 . 320 
ee he Wy ” » um  m mm. nearer base 300. 310 
80. 295 
Roe ” Poy A “ | dea (se J ” | As ” 
The breaking strain for the last hook was 4 Kilo’s, the break 
taking place at the first part of the thickened coil, whilst the 
thin and slightly twisted peduncle broke only with 6 kilo, near 
to the point of attachment with the stem. If the area in con- 
tact is narrow, and lies in the most irritable region, and if the 
pressure be not too great, a local increase in the thickening 
may be seen at the point directly stimulated. 
Contact with a rough surface but with extremely slight 
pressure, if sufficient to cause any marked thickening, is also 
Sufficient to cause a marked curvature and coiling, the number 
of coils formed being mainly dependent upon the diameter of 
the object with which the hook tendril is in contact. 
Strychnos laurina. 
S A- 
Hooks attached to stem, 0.3 cm. diam. After 25 days averaged 347 . 3525 
poe twig, 2 5 cm. diam., 29 cm. mp pegenrey w 16 200 . I 
Nn " 7] 1.5 n 1 uv ” 210 . 920 3 1!/ 4 
af 7] " 9 n 3 W n 16 n ” j 
w W " “ 
= 
Si 
oOo NM 
“we 
Hooks bound with wire tightly to flat piece of wood oi " " 
Untouched hooks ” 110. 135 Vs 
een to stem 0.5 diam. for 2 months. Hooks oes wu cory 545.475 11/,1* 
e 415 14,2* 
W " i " non 7] 
sf Co AE eS Ok ee ” ” ” 
nw 465 . 435 fy 
