Fig. 5.

Alternative relationships between the rhythms of the Etide (upper panel) and of the movements of two different leaves, K191 and K193, recorded simultaneously (lower panel) from Ph. coccineus. K191 is mainly ‘in phase’ with the Etide, K193 is mainly ‘in antiphase’ with the Etide. The phase relationships become inverted on the first day shown (20/1/1930) when a singular A peak is present in the Etide profile, on the day before LQ Moon. Also noted are the displacements (h) between turning points of leaftide and Etide (short vertical arrows and numerals – upper arrows and τ values apply to K191, lower arrows and τ values to K193, using leaf maxima as the reference), whatever their phase relationship. Note also the range of leaftide periods, τ (horizontal arrows and values in h). Variations of τ are possible because of the changing structure of the Etide and its continuing influence upon leaf movement. Conventions which apply to the figure are the same as those for Figs 2 and 3. Leaf movements have been redrawn from fig. 5 in Bünning and Stern (1930).