SHORTLY after 1 a.m. on September 8, an earthquake of intensity 5 or more (according to the Bossi-Forel scale) was felt in the west of Sussex, especially at Horsham and the neighbouring village of Warnham. The earthquake is of some interest owing to its connexion with the series of shocks that have occurred for nearly three centuries in the district around Chichester, the first known to us being that of the year 1553. A little more than a century ago, between September 1833 and August 1835, there was a series of eight earthquakes in the district, which were studied by a small committee, the first ever instituted for the study of British earthquakes. One of the most important of these earthquakes was that of January 23, 1834. It was of about the same intensity as the recent shock. Its centre lay 4 miles west-north-west of Chichester, and the longer axis of its disturbed area of 780 sq. miles, if produced, passes through Horsham. Headers who are willing to aid in the investigation of the new earthquake should send then“accounts to Dr. A. T. Dollar, Emmanuel College, Cambridge.