Circumnutation of Some Flowering Plants. 69 
work, but insufficient data were collected from which to gen- 
eralize. Those obtained have been incorporated with the 
writer’s later observations. The Scarlet Runner studied was a 
seedling, the Lonzcera had grown from a cut-back plant. 
A fine specimen of Lonicera brachypoda growing in the gar- 
den, and having no chance to climb, bore numerous healthy 
tips. It was surrounded by a box, whose top and bottom had 
been removed, as well as some boards from the side. This 
was partly covered by glass, but plenty of air was allowed 
entrance. Some of the shoots were so vigorous that they 
needed no support; others were long stems and had to be 
supported. 
On July 18, no glass was used, but record was kept by 
marks on rods of wood laid above the tip. The movements 
then obtained were the slowest recorded, and it is likely that 
the extra protection from wind and retention of heat by the 
glass cover, produced the quicker movements of August 15. 
When watched in the greenhouse, Lonicera showed itself 
extremely sensitive to heat; high temperature invariably 
being associated with rapid movement. 
Our shortest time is 1 hour 43 minutes; Darwin obtained 
7 hours 30 minutes. He makes no mention of temperature 
beyond saying ‘“‘a warm room in the house.” The full re- 
sults obtained are appended. 
Scarlet Runner seedlings were used in the greenhouse for 
experiment. The panes of the house were whitewashed, and 
the intensity of light thus diminished. The tips never needed 
support, young ones being invariably chosen. The results 
as appended show that the shortest time obtained with this 
species was I hour. On April 5, we obtained 1 hour 20 
minutes, as compared with Darwin's observation on May 2 
—1 hour 55 minutes. 
Wisteria chinensis—On July 11, young sprouts of this 
species were found in good condition on a cut-back plant in 
the greenhouse ; one that had been entirely shorn of branches 
