Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 IV ELECTROMOTIVE ACTION IN MUSCLE 369 circuit repeats itself, and if the process of negative closure has run out during this period, no deflection will be obtained. On actually working the experiment, however, we still find a negative deflection increasing slowly throughout the entire period of excitation, in the direction of the compensating current, due apparently to the diminutional after-effect of excitation upon the muscle current as described. Now, if the exciting slider is brought more forward, so
Electro-physiology (1896-98) Electro-physiology electrophysiolog01bied Year: 1896-98 IV ELECTROMOTIVE ACTION IN MUSCLE 369 circuit repeats itself, and if the process of negative closure has run out during this period, no deflection will be obtained. On actually working the experiment, however, we still find a negative deflection increasing slowly throughout the entire period of excitation, in the direction of the compensating current, due apparently to the diminutional after-effect of excitation upon the muscle current as described. Now, if the exciting slider is brought more forward, so that excitation occurs while the galvanometer contacts are still dipping into mercury, we find FIG. 110 —Schema of rheotome experiment. (Bernstein.) at a particular point a sudden increment in the deflection, which increases rapidly in the negative direction on pushing on the slider, and finally reaches a maximum, after which it decreases again with further displacement of the slider, and at last remains persistently lower than it was at the beginning of the excitation. This shows that there is a measurable interval between the moment of excitation at one point of a muscle with parallel fibres (Bernstein always chooses the lower end of the sartorius as being free from nerves), and the beginning of the negative variation at the other, provided with an artificial cross-section; 2 B
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