Abstract
1. 1. The resting membrane potentials of fast and slow muscle fibres in the developing mouse have been investigated. 2. 2. In both types of muscle fibre, the resting membrane potential appears to be a function of the age of the animal. 3. 3. In young animals, the resting membrane potentials of slow muscle fibres are higher than those of fast; in more mature animals the situation is reversed. 4. 4. Slow muscle fibres appear to reach electrophysiological maturity at an earlier age than do fast muscle fibres. 5. 5. The results are discussed in detail with emphasis on the difficulties involved in interpretation.
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