Experimental arrangements--The Quadruplex Nyctitropic Recorder--Diurnal movement of the leaflet of _Cassia alata_---Effect of variation of temperature--Effect of variation of light--Diurnal movement of the terminal leaflet of _Desmodium gyrans_--The 'midday sleep' 535 XLVIII.--DIURNAL MOVEMENT DUE TO VARIATION OF TEMPERATURE AFFECTING GROWTH. Tropic and nastic movements--Distinction between thermonastic and thermo-geotropic action--Diurnal movement of _Nymphæa_--Action of light--Effect of variation of temperature 546 XLIX.--DAILY MOVEMENT IN PLANTS DUE TO THERMO-GEOTROPISM. Characteristics of thermo-geotropic movements--Diurnal movement of Palm trees--Diurnal movement of procumbent stems and of leaves--Continuous diurnal record for successive thermal noon--Modification of the diurnal curve--Effect of fluctuation of temperature--Effect of restricted pliability of the organ--Effect of age--Effect of season--Reversal of the normal rhythm--Effect of constant temperature--Diurnal movement in inverted position 554 L.--THE AFTER-EFFECT OF LIGHT. Electric after-effect of light--After-effect at pre-maximum, maximum, and post-maximum--Tropic response under light, and its after-effects at pre-maximum, maximum, and post-maximum 569 LI.--THE DIURNAL MOVEMENT OF THE LEAF OF _MIMOSA_. Four different phases in the diurnal record of _Mimosa_-- Different factors determining its diurnal movement--Diurnal variation of geotropic torsion--Autonomous pulsation of the leaf of _Mimosa_--The Photometric Recorder--Effect of direct light--The evening spasmodic fall of the leaf--Diurnal movement of the amputated petiole--Diurnal curve of the petiole of _Cassia alata_--Response of _Mimosa_ to darkness at different parts of the day--After-effect of light at pre-maximum, maximum, and post-maximum 576 ILLUSTRATIONS. FIGURE. PAGE. 93. Arrangement for compensation of growth-movement by equal subsidence of plant-holder 257 94. Photograph of the Balanced Crescograph 258 95. Balanced Crescographic record 260 96. Record showing the effect of CO_{2} 265 97. Effect of ether and of chloroform 266 98. Diagrammatic representation of effects of Indirect and Direct stimulation 275 99. Tropic curvature of _Crinum_ 276 100. Turgor variation caused by Indirect stimulation 281 101. Response of _Mimosa_ leaf under transverse transmission of effect of electric stimulus 282