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.) Loose figures (possibly for publication), notes on experiments re sensory nerves, branches, motor fibres, polarisation and summary of experiments, dated February - September 1948. Also correspondence with David Whitteridge (Oxford University) enclosing printed communications by Katz and JZ Young for a UCL meeting titled 'Electric membrane properties of frog muscle' and 'Regulation of the afferent discharge from a frog muscle', both dated February 1948. 1948