10
LIFE MOVEMENTS IN PLANTS
point of the trunk is one metre. The movement is not
Fig. 3. Record of diurnal movement of the 'Praying' Palm (Phœnix dactylifera). Thermographic curve for 24 hours commencing at 9 in the evening is given in the upper record; the corresponding diurnal curve of movement of the tree is given in the lower. Successive dots at intervals of 15 minutes; thick dots at intervals of an hour.
