Information
Description

Notes that observations were taken on a number of individuals over a period of two years prior to the publication of this paper: 'Marked difference was met in the frequency of intermission required to extinguish flicker in the same physical light for different observers...These differences remained characteristic between the observers A., J.S.M., C.S.S., and G.C., throughout the two years during which the observations were in progress.' (33)

X