Measurement of Rate of Shrinkage of Turgid Tissues . /. 285 
cork Is gripped by a metal clamp, F, sliding horizontally in and out of 
a horizontal arm of the vertical support E. The nozzle and plant cylinder 
are suspended vertically in a conical glass chamber formed of an inverted 
Erlenmeyer flask with the base cut off. 
To the upper end of the cylinder is attached a slender glass hook B, the 
base of which pierces the cylinder horizontally, while the shank stands 
Fig. i. 
vertically and centrally above it. The upper end of the hook carries 
a loop of very fine cotton, waxed to prevent torsions, and attached at 
its upper end to the projecting wire arm of the optical lever. The upper 
end of the glass hook is bent sharply in a plane perpendicular to that 
of the piercing base to avoid slipping. The glass nozzle can be adapted by 
means of rubber tubing to take tissue-cylinders of 1 to 8 mm. diameter. 
The horizontal part of the nozzle is connected by rubber tubing with 
a glass spiral, H, contained in the flask chamber. Three tubes pass through 
