experiment on animal nerve is similar to that employed for the corresponding investigations on the plant. The choking coil is used to prevent the stimulating induction current from getting round the circait of constant current. The specimen is held on an ebonite support, and every part of the apparatus insulated with the utmost care.
VARIATION OF VELOCITY OF TRANSMISSION.
In the case of the conducting tissue of the plant a very strikin? proof of the influence of the direction of cur- rent on conductivity was afforded by the induced varia- tion of velocity of transmission. Equally striking is the result which I have obtained \vith the nerve of the frog.
Experiment 44. — The experiments described below were carried out during the cold weather. The following re- cords (Fig. 49), obtained by means of the pendulum myo- graph, exhibit the effect of the direction of current on
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Fig. 49_EffecL of heterodromoiis and homodromous current in inducing variation in velocity of transmission throu^b nerve. N, normal record; upper record shows enhancement, and lower record retardation of velocity of transmission under heterodromous and homodromous current?, respectively.
the period of transmission through a given length of nerve. The latent period of muscle being constant, the variations
