ILLUSTRATIONS 



KIG. V AGE 



1. Record of Healthy Adult and Senile Human Pulse (Broadbent) . . 3 



2. Effect of Muscarin in arresting Pulsation of Frog's Ventricle (Cushing) 4 



3. Record of Human Pulse (Broadbent) ...... 4 



4. Demonstration Optical Pulse-Recorder ...... 7 



5. Death of Plant, and Arrest of Pulsation, by Poison .... 8 



6. Death, and Arrest of Pulsation, in Leaflet of Desmodium by Strong 



Electric Shock 8 



7. Response of India-rubber ........ 12 



8. Mechanical Lever Recorder . . . . . . . . 12 



9. Series of Contractile Responses in Muscle 13 



10. Photographic Record of Longitudinal Contractile Response in 



ordinary Stamens (Brotvnea ariza) . . . . . . . 13 



11. Differential Lateral Response of Compound Strip . . . .13 



12. Plant Chamber and Recorder 16 



13. The Electro-thermic Stimulator . . . . . . 17 



14. Diagram of Connections for Stimulation by Condenser Discharge . 18 



1 5. Photographic Record of Response and Recovery of Mimosa, taken on 



a slowly moving drum . . . . . . . . .21 



16. Photographic Record of Response in different specimen, taken on a 



faster-moving drum . . . . . . . . . 21 



17. Response of Biophytum to Thermal Stimulation .... 24 



18. Response of B iophytum to Electric Stimulation . . . . . 24 



19. Effect of Load ... 25 



20. The Spiral Spring-Recorder ........ 26 



2 1 . Isometric Response of Mimosa ....... 26 



22. Hydraulic Model for Explanation of Electric Response . . . 31 



23. Electrical Response in Plant by Method of Block . . . -32 



24. Electric Response Recorder ........ 33 



25. Method of Transmitted Stimulation 33 



26. Simultaneous Mechanical and Electrical Responses in Biophytum . . 34 



27. The Abnormal Positive preceding the Normal Negative in Mechanical 



and Electrical Responses in Biophytum 37 



28. Response of Selenium to the Stimulus of Light . . . . . 39 



