72 LEAF-CLIMBERS. Cuap. IT. 
fifteen trials by twice or thrice lightly rubbing with a 
” thin twig several internodes; and in about 2 hrs., but 
in one case in 3 hrs., all were bent: they became 
straight again in about 4 hrs. afterwards. An inter- 
node, which was rubbed as often as six or seven times, 
became just perceptibly curved in 1‘hr. 15 m., and 
in 3 hrs. the curvature increased much; it became 
straight again in the course of the succeeding night. 
I rubbed some internodes one day on one side, and 
the next day either on the opposite ‘side or at right 
angles to the first side; and the curvature was always 
towards the rubbed side. 
According to Palm (p. 63), the petioles of Linaria 
cirrhosa and, to a limited degree, those of L. elatine 
have the power of clasping a support. 
SOLANACER.—Solanwmn jasminoides—Some of the 
species in this large genus are twiners; but the present 
species is a true leaf-climber. <A long, nearly upright 
shoot made four revolutions, moving against the sun, 
very regularly at an average rate of 3 hrs. 26m. The 
shoots, however, sometimes stood still. It is con- 
sidered a greenhouse plant; but when kept there, the 
petioles took several days to clasp a stick: in the 
hothouse a stick was clasped in 7 hrs. In the green- 
house a petiole was not affected by a loop of string, 
suspended during several days and weighing 23 
grains (163 mg.); but in the hothouse one was made 
to curve by a loop weighing 1°64 gr. (106-27 mg.) ; and, 
on the removal of the string, it became straight again. 
Another petiole was not at all acted on by a loop 
