The torsional response of _Mimosa_ exhibits a diurnal variation similar to that exhibited by the leaf in normal position. The leaf of _Cassia alata_ exhibits a diurnal movement of the same type as that of _Mimosa_. The spasmodic fall of the leaf towards evening is not due to the increased mechanical moment caused by the forward position of the sub-petioles. The record of the leaf with amputated sub-petioles exhibits the sudden fall in the evening as that of the intact leaf. The evening fall of the leaf of _Mimosa_ is shown to be due to the post-maximum after-effect of light, which causes an 'over-shooting', the leaf undergoing a fall below the position of equilibrium. B. S. Press--5-11-1919--19754J--750--R. D'S. End of the Project Gutenberg EBook of Life Movements in Plants, Volume II, 1919, by Sir Jagadis Chunder Bose