W. H. Brewer on the Motions of Winding Plants. 205 
was pendant and unsupported. ; . 
These indicate the same fact sustained by the experiments with 
the tubes, viz., that plants wind best when the support is warmer 
e * hd £ ; 
before the contact is more than accidental. ; : 
There appears to be much difference in the force with which 
different species of winding plants assume the spiral. The Con- 
Volvulus seemed much more sensitive to the influence of heat 
ly as a more soli d to in- 
: olid material. Many experiments seemed to in 
dicate that contact with the support modifies the force with which 
Into a thin glass tube at night; the fibres of the plant would as- 
4 shorter spiral and sometimes the plant itself would wind 
‘ound on the inner surface of the tube in the same form and 
“ection as if it had enclosed some cylinder in its turns, while 
ite Not so qroated would remain nearly straight and their 
Spiral. e 
materi; petiments with tubes of various colors gave no results 
io different from the others. 
ND SERIES, Vo RCH, 1859. 
£ 
No. 80. “« 
Bs a (i iy . 
