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This paper contains a statement of the origin, progress, and completion of this survey. It is accompanied by maps of the declination, inclination, and magnetic force, which have been drawn at the Hydrographic Office of the Admiralty under the superintendence of Captain Frederick John Evans, R. N., F. R. S. The paper consists in great measure of Tables, giving the observation of each of the three magnetic elements, with reductions in every case for the secular change between the date of the observation and that of the epoch (1842-5) for which the maps are constructed.

VI. Contributions to terrestrial magnetism.—No. XII. The magnetic survey of the British Islands, reduced to the epoch of 1842-5