[Vor. 1, 1914| 
184 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
ExPLANATION OF PLATE 
PLATE 3 
Fra. 1. Culture flasks containing quartz sand joined together in series of eight 
each, but before arrangement into groups. 
Ес 2. Five series of culture flasks arranged in a group with a common connect- 
ing tube (onthe left) and a series of three triple wash-bulbs. On the right, the rubber 
tubing, provided with pinchcocks, is shown attached to each series for use in aération. 
