a micropotometric device previously described by the writer was used to determine quantitatively the velocity of water influx in cubic microns per square micron of hair surface per minute of comparatively older and younger root hairs of radish seedlings in a humid atmosphere at 29 degrees +/- 1 degrees c. when the micropotometers were filled with hoagland solution at ph 6.8 .
C0018494
hair
C1182707
root