Since the return of the St. George Expedition from the Pacific in 1925, a series of nine papers (2–8, 26, 27), describing the geology of most of the volcanic islands visited, has been published, and it is now possible to co-ordinate the results already arrived at, and to use them in an attempt to throw light on the structure of the Pacific basin.

The Chapters on the Geology of Scotland, by B. N. Peach and John Home, reveals very clearly the complete divergence in the views of these two masters concerning certain fundamental problems of the Moine Series. Peach (1, pp. 199–200) regards the Moine Series as the equivalent of the Torridonian and its metamorphism as entirely post-Cambrian. Home (1, pp. 200–1), on the other hand, believes the Moine Series to consist mainly of sedimentary schists of pre-Torridonian age which formed part of the land-barrier separating the Cambrian sea in the North-West Highlands from that in which the fossiliferous Highland Border Rocks (Cambro-Ordovician) were laid down.

New loop-ways on the Great Western Railway to by-pass stations at Westbury and Frome have recently provided complete sections of Corallian Beds and Cornbrash.

The seismicity of any region depends partly on the frequency, and partly on the intensity, of the earthquakes that occur within it. If earthquakes of all intensities are included in making such estimates, the weight to be given to the intensity must at present be to a great extent arbitrary. If, however, the determination is confined to earthquakes of the highest degrees of intensity, the results, though incomplete as representatives of the actual seismicities of the various regions considered, may yet give with some approach to accuracy their relative order of magnitude. The object of this brief paper is to provide such estimates for the various regions of the world and for the provinces of Italy that are shaken by destructive earthquakes.

In 1916 the Whitwick, South Leicestershire, and Ellistown Collieries put down a boring near Ellistown Colliery in Leicestershire to prove the measures below the Deep or Roaster Coal. Early in the following year Professor W. W. Watts and I examined in detail the cores of this boring, and collected samples of the rocks and fossils from them. The rock-descriptions in the journal of the boring-foreman were checked and in many cases altered and enlarged by Professor Watts and myself after examining specimens in the laboratory, some of them in thin slices under the microscope. Mr. R. Bullen Newton, of the Natural History Museum, was good enough to name some of the fossils.