“…From this, the rate of work under resting conditions may be calculated for comparison with energy turnover data available from other measurements (Shanes, 1951 c). The efficiency of about ten per cent so obtained is of a reasonable order of magnitude and in keeping with that computed from bio-electrical measurements in other systems (Crane, 1950). On this basis, then, the postulate that permeability during inhibition is essentially that during steady state conditions appears to be acceptable.…”