The successful Colloquium which was held in Edinburgh last August was described in the October number of the Gazette, and the suggestion was there made that a Colloquium should be held in the same city in the present year, in conjunction with the Napier Tercentenary Celebrations. This suggestion has been adopted by the Edinburgh Mathematical Society, who have now resolved to hold an open Colloquium on July 28th to 31st inclusive, immediately following the Napier celebrations on July 24th to 27th.