Fig. 14.

Leaf ‘relaxation’ movements in Ph. coccineus. Apparently normal ascents were initiated at the start of the daytime period but could not be maintained, and the leaf descended. The descent was temporary and was reversed by a ‘relaxation’ ascent (*). Timings of secondary ascents were close to maximum rates of descent of the Etide values δ(δg) (○). Other conventions are as for Figs 2 and 3. Leaf movements redrawn from fig. 18 in Bünning (1931).