The appearance of a statistical paper in a symposium honoring the founding of psychophysies was surely to have been expected. These two disciplines had their modern beginnings in about the same period of time and the well-known founders of each made at least some contributions in the other. Karl Pearson’s research on the personal equation is still a good example of painstaking psychophysical experimentation. Indeed much of his statistical reputation rests on techniques he developed to analyze this data. Fifty years ago Urban published, in a psychological journal, the final form of the Müller-Urban weights. Twenty years later biologists rediscovered Urban’s weights and now use them routinely. Spearman, too, contributed to both fields.