LIST OF ILLUSTRATIONS. XVII 



FIG. PAGE 



21 Diagram illustrating the use of turgesoent tissue in De Vries' 



experiments on isotonic coefficients ., ■ . . . 115 



22 Tracings from split portions of the hypocotyl of Eicinus used 



in experiments on isotonic coefficients .... 116 



23 PfeHer's gypsum method 120 



24 Arrangement for demonstrating that a turgescent shoot loses 



rigidity when bent 127 



25 Micrometer -screw used in growth experiments . . . 138 



26 Eeoording auxanometer 141 



27 Method of using the auxanometer-lever .... 145 



28 Tracing illustrating the effect of an increase of temperature 



on growth 147 



29 Hanging writer for recording geotropio or other movements 



on a revolving drum 158 



30 Illustrating the curvature of a root which has recovered from 



the effects of decapitation 160 



31 Curvature of roots produced by small pieces of card attached 



to the tips 162 



32 Drooping of laurel leaves in a frost 164 



33 A twig of Veronica salicifolia exposed to oblique illumination 169 



34 The Hinostat 171 



85 Section showing part of the mechanism of the klinostat . 172 



36 A seedling Cucurbita which has germinated on the klinostat ; 



showing the frill-like growth of the heel or peg . . 177 



37 Diageotropism of the flower of Narcissus poeticus . . 179 



38 The twisted intemodes of Lonicera 181 



39 Leaves of clover in the day and night position . . . 204 



40 The sleep-movements of Mimosa recorded on a drum by 



means of a hanging writer 206 



41 Paraheliotropic movement in Averrhoa bilimbi . . . 207 



42 Diagram representing the circumnutation of a cabbage- 



seedling 211 



43 Apparatus for distillation under reduced pressure . . 228 



