| Description | Manuscript note to Karl Pearson on a "Piece of Mathematical Research", expanding on a study by G Udny Yule, and enclosing notes on the "Distribution of immunity units", and an offprint of "On the Distribution of Deaths with Age when the Causes of Death Act Cumulatively, and Similar Frequency Distributions" by G Udny Yule, from the Journal of the Royal Statistical Society, volume 73, part 1, 15 January 1910. |