: 127 
: 1893] The Tendrils of Passiflora. 
, i il in the 
wero at the basal portion, the free tendril Voge veneemiots 
form of a helix and no torsions would result. 
€ twists the contiguous Sirient fee 
ing continues until the eee pie the 
iling force of the first pas bedience 
oils in the opposite direction — — ies 
Pi eich the te force ae 
arly straight. The eget: d in two 
tendril is acted upon similarly until it is Fhe number 
tO seven Portions Separated by straight parts: i e of the 
of the Portions will be determined by the relative oa tl the 
ili € resistance of the tendril. | While 
This twist 
Stronger than the co 
twisted part forms ¢ 
tots own torsion, 
~— qualized will be ne 
growth in length to compensate ais 
was found to be the case a 
4 : Extended observations were made to sae te st 
' the distance tween the base of the tendril at the bo > 4 
* and the s 
irals, Such as 
nts 
| In so doing. Repeated eases 
ear i he fact that the tendril drew the portion of the vine 
mach =, toward the : 
wa third its length 
Weights of three §tams upward were suspended from the 
Science, 1, 242. Oct. 1886, 
