Conditions for obtaining electric response—Method of injury—Current of injury—Injured end, cuproid: uninjured, zincoid—Current of response in nerve from more excited to less excited—Difficulties of present nomenclature—Electric recorder—Two types of response, positive and negative—Universal applicability of electric mode of response—Electric response a measure of physiological activity—Electric response in plants
ELECTRIC RESPONSE IN PLANTS—METHOD OF NEGATIVE VARIATION
Negative variation—Response recorder—Photographic recorder—Compensator—Means of graduating intensity of stimulus—Spring-tapper and torsional vibrator—Intensity of stimulus dependent on amplitude of vibration—Effectiveness of stimulus dependent on rapidity also.