THE VEGETATIVE FUNCTIONS OF PLANTS 
by a very simple experiment. A small leafy branch of 
any plant (a branch of some evergreen is excellent to 
mt 
FIG. 33. Experiment to illustrate the so-called "lifting power" of 
transpiration, d, dish of mercury; mt, surface of mercury column that 
has risen in the glass tube, gt; rt, rubber tube; br. branch of a pine tree, 
whose leaves are transpiring. 
use) is inserted in the end of a piece of glass tubing about 
3 feet long. The joint between the glass and the branch 
