ILLUSTRATIOiNS 



HG. PACE 



1. Compound lever of High Magnification Crescograph . . 8 



2. Mechanism for oscillation of plate . . . , .10 



3. Complete recording apparatus . . . . . .11 



4. Crescographic records of the absolute rate of growth, on a 



stationary plate . . . . . . . .14 



5. Effect of temperature, on a moving plate . . . .15 



6. Effect of variation of temperature on a dead branch, taken on 



moving plate . . . . . . . .17 



7. Effect of temperature recorded on a stationary plate . . 18 



8. Record of a single growth pulse of Zephyranthes . . .18 



9. Diagram of Method of Balance by Falling Weight . . 24 



10. Record showing condition of overbalance and underbalance 



of growth , . . . . . . . .25 



11. Diagram of Method of Inclined Plane . . . . .27 



12. The complete apparatus for Balance by Inclined Plane . 29 



13. Record showing the effect of Carbonic Acid Gas on growth . 31 



14. Arrangement for variation of temperature of plant-chamber . 35 



15. Records of growth, on stationary plate, at different tempera- 



tures .......... 36 



16. The Ihermocrescent Curve ...... 39 



17. Curve showing relation between temperature and rate of 



growth ......... 41 



18. Effect of Carbonic Acid Gas on growth .... 44 



19. Effect of vapour of Ether on growth ..... 45 



20. Effect of vapour of Chloroform ...... 47 



21. Effect of Sulphuretted Hydrogen (Wheat seedhng) . . 49 



22. Effect of Copper Sulphate solution . . . . .49 



23. Growth at standstill revived after irrigation with water . . 52 



24. Effect of irrigation on growth . . . . . -53 



25. Ihe effects of alternate application and withdrawal of water 



on growth ,...,.... 55 



26. Response of the pulvinus of Mimosa to irrigation and to 



withdrawal of water ....... 56 



27. Induction Coil ........ 63 



28. Time-relations of the response of a growing organ to electric 



stimulus of increasing intensity ..... 64 



29. Records of contractile response under increasing intensities of 



electric stimulation of 0-25, i, and 3 units ... 66 



30. Effect of continuous electric stimulation .... 67 



31. Contractile response of leaf of INIimosa .... 68 



