1905] DARBISHIRE—A PPARATUS FOR TRANSPIRATION STREAM 359 
the main shoot by cutting the stem a short distance above the lowest 
lateral shoot (fig. r). After a very short time the mercury in the 
limb (g) of the gauge nearest the plant was seen to rise, as the latter 
was withdrawing water from the pinometer. As the mercury rises, 
the pull on the lower end of the shoot and on the upper end of the 
m) | WHMIS EL 
Fic, 1.—A fuchsia plant with one pinometer inserted just above the lowest 
lateral shoot: a, the attachment of the upper shoot; }, that of the root stump; c, the 
connection leading to the mercury gauge; d, the top opening of the pinometer, closed by 
rubber tubing and pinch-cock; g, the level of mercury in inner, /, that in outer limb of 
gauge; k, millimeter scale; the latter indicates shoot ti d the shoot wilting; 
the stump at b, under pressure from the root, is flourishing. 
Toot-end of the plant gets stronger, and gradually the leaves of the 
Upper shoot wither. It will be noticed that the leaves of the lowest 
lateral shoot are quite fresh. Before the upper shoot dies altogether 
its axillary buds will generally develop and form small leaves, but 
€ven these succumb in the end. 
