On lunar periodicities in earthquake frequency

1.Introduction .—The paper is a discussion of Professor Milne’s Catalogues of 8331 earthquakes, recorded as having occurred in Japan, during the eight years 1885 to 1892 inclusive. These catalogues, forming vol. 4 of the ‘Seismological Journal of Japan,’ are unquestionably the most complete ever constructed for an earthquake-disturbed country. The discussion is really a working out of certain lines suggested in a paper on “Earthquake Frequency,” communicated by me in May, 1885, to the Seismological Society of Japan, and published in vol. 9 of the ‘Transactions’ of that Society.