1905] DARBISHIRE—APPARATUS FOR TRANSPIRATION STREAM 361 
striking. The leaves of the upper shoot are dead, there being a strong 
pull on the lower end. The leaves of the middle shoot are flourishing, 
there being a push on its lower end, although the lower pinometer 
is separated from the upper one by about two inches of stem only 
LTA, 
Fic. 2.—A fuchsia plant with two pinometers: the lettering as in fig. 1; the 
lower Pinometer (P,) shows root pressure and its shoot (az) is flourishing i the upper 
one (P,) exhibits shoot suction, and its shoot (a2) is wilting; r, reservoir of water, 
5; its spout. 
(between a, and b,). A fortnight after being set up, a reading for 
this experiment showed a difference in level of the two columns of 
Mercury of 18™™ in the lower pinometer, indicating pressure from 
the root, and a difference of 20™™ in the upper pinometer, indicating 
Suction from the shoot. 
