CONTENTS. 



PART III. 



TROPISM IN PLANTS. 

 XXII.— THE BALANCED CRESCOGRAPH. 



PA«E. 



Principle of the Metliod of Balance — Compensating move- 

 ment — Grrowtli-scale — Sensitiveness of the Crescographic 

 Balance— Effect of CO.,— Effect of anaesthetic,-, . . 255 



XXIIL— ON TROPIC MOVEMENTS. 



Complexity of the problem — Contradictory nature of 

 responses — Two classes of tropic responses — Longitudinal 

 transmission of effect of stimulus — Transverse trans- 

 mission of effect of stimulus — Modificat'on of tropic 

 curvature by conducting power of tissues and diCEerential 

 excitability of the organ ...... 2Gfl 



XXIV.— TROPIC CURVATURE WITH LONGITUDINAL TRANS- 

 MISSION OF EFFECT OF STIMULUS. 



Dual impulses, positive and negative, caused by stimulus — 

 Direct and Indirect stimulus — Tropic effect of Indirect 

 stimulation . • . . . . . . . . 271 



