Unpublished paper, 'On the seismic effect of tidal stresses' by R [Richard] Dixon Oldham Oldham's investigation arises 'out of the discussion of the aftershocks of the Indian earthquake of 1897, in which it was shown that these aftershocks seemed to show that the tidal stresses set up by the Sun had a distinct effect in determining the time of uccrrence of earthquakes.' Includes three graphs of diurnal and semidiurnal frequency of Japanese earthquakes. Subject: Geology / Seismology Received 28 March 1904. Read 16 June 1904. Communicated by J W [John Wesley] Judd. 1904