ILLUSTKATIONS 



FIG. 1*AGE 



1. MECHANICAL LEVER RECORDER 3 



2. ELECTKIC METHOD or DETECTING NERVE RESPONSE . . 6 



3. DIAGRAM SHOWING INJURED END OF NERVE CORRESPONDS TO 



COPPER IN A VOLTAIC ELEMENT 8 



4. ELECTRIC RECORDER 11 



5. SIMULTANEOUS RECORD OF MECHANICAL AND ELECTRICAL 



RESPONSES 13 



6. NEGATIVE VARIATION IN PLANTS 19 



7. PHOTOGRAPHIC RECORD OF NEGATIVE VARIATION IN PLANTS 20 



8. RESPONSE RECORDER 21 



. THE COMPENSATOR 22 



10. THE SPRING-TAPPER 23 



11. THE TORSIONAL VIBRATOR 24 



12. RESPONSE IN PLANT TO MECHANICAL TAP OR VIBRATION . 25 



13. INFLUENCE OF SUDDENNESS ON THE EFFICIENCY OF STIMULUS 26 



14. THE METHOD OF BLOCK 28 



15. RESPONSE IN PLANT COMPLETELY IMMERSED UNDER WATER 29 



16. UNIFORM RESPONSES IN PLANT . . . . . . 36 



17. FUSION OF EFFECT UNDER RAPIDLY SUCCEEDING STIMULI IN 



MUSCLE AND IN PLANT 36 



18. ADDITIVE EFFECT OF SINGLY INEFFECTIVE STIMULI ON 



PLANT 37 



19. 'STAIRCASE EFFECT' IN PLANT 37 



20. APPEARANCE OF FATIGUE IN PLANT UNDER SHORTENED 



PERIOD OF REST 39 



