It will probably be conceded, by those who have studied the Somersetshire portion of the British Coal-field, that the correlation of the various parts of it is not, at the present time, so perfect that any attempts to improve it are entirely uncalled for. The following conjectures as to whether some of the facts relied on as proving the commonly-accepted theory of the structure of the Somersetshire Coal-measures, and their general correlation with those in Gloucestershire, may not possibly admit of an interpretation differing from that usually assigned to them; are put forward in the hopes of indicating a line of research which may eventually, when modified by the results of further investigations, lead to a solution of some of the numerous difficulties at present standing in the way of a satisfactory understanding of this extremely complicated district.