| Specimen A | Normal rate Acceleration under anode | 0·10 µ per sec. 0·155 µ per sec. |
| Specimen B | Normal rate Retardation under cathode | 0·48 µ per sec. 0·14 µ per sec. |
The effects given above take place under the action of a feeble current. Strong current on the other hand induces a retardation or an arrest of growth.
I have in the above experiments demonstrated the normal effect of anode in inducing expansion and acceleration of rate of growth; the cathode was shown to induce contraction and retardation of growth. Unilateral application of anode and cathode thus induces appropriate curvatures in pulvinated and in growing organs.
SUMMARY.
The effects of an electric current on growth is modified by the direction of current. A feeble anodic current enhances the rate of growth; a cathodic current on the other hand induces a retardation of the rate. Strong current, both anodic and cathodic, induces a retardation.
[6] "Irritability of Plants," p. 212.