Depolarization and Action potentials material Research material relating to two papers by Katz: 'Action potentials from a sensory nerve ending' (J. Physiol. 1950 111: 248-260.) 'Depolarization of sensory terminals and the initiation of impulses in the muscle spindle' (J. Physiol. 1950 111: 261-282.) Notes on experiments, calculations, diagrams, handdrawn graphs and conclusions re sensory axons, photographic reduction, stretch receptors, dynamic/static discharge and use of RC/DC amplifiers, dated October 1948 - September 1949. 1947-1949