In comparing the quartz-schists with the Devonian sandstones, or grit-bands, several original minerals can be traced from the one to the other, e.g. tourmaline, mica, and at least two quartzes. In the case of the Green Rocks and Devonian Volcanics we are met at the outset with the difficulty, that not a grain or crystal of an original mineral has been recorded with confidence as occurring in the metamorphic Green Rocks; though there seems to be little doubt that the latter are often metamorphosed diabases.

Mr. Marr's valuable communication on the Coniston Limestone Series, which appeared in the March Number of this Magazine, is sure to be welcomed as an excellent summary of the geology of this interesting group of rocks. It contains a digest of most of the published work relating to the Coniston Limestone Series, and also many new facts and arguments drawn from Mr. Marr's own observations in the field.

Compared with that of the year before, the British seismic record for 1891 is somewhat meagre. It includes a slight earthquake felt in North Cornwall on March 26, several at Invergarry, Ardochy, and Loch-hourn Head in Inverness-shire; and one other, believed to be that of an earthquake, at Bournemouth on October 25. The remarkable series of earthquakes felt between November 15 and December 14, 1890, in the district round Inverness seems to have ended at the latter date; for Mr. J. Birnie, a very careful observer residing at Balnafettack, informs me that he has felt none during the past year; and his evidence is especially valuable, since the epicentra of nearly all the shocks must have been close to that village.

Geological opinion is still divided on the subject of the formation of the Boulder-clay. By some it is held to be the sole work of the ice, and accumulated beneath it; by others it is looked upon as a marine deposit, though deriving its materials from the grinding action of the ice-sheet or glacier. Some geologists, again, hold that the “Till”—as distinct from the Boulder-clay— was formed beneath the ice, but that the latter is a marine deposit laid down in glacial seas.

Over twenty years ago I commenced the study of the glacial deposits of the neighbourhood of Liverpool, and as the observations grew they came to embrace a considerable share of the drainagebasin of the Irish Sea.

I have personally inspected and kept full records of all of the important artificial excavations likely to throw light upon the subject, in addition to examining and making sections of the natural exposures of glacial drift which abound on the north-west coast of England, the coast of Wales, and in the river valleys draining into the Irish Sea, and to a lesser extent the drift on the east-coast of Ireland and the south of Scotland.

During a recent visit of the Warwickshire Naturalists' and Archifiologists' Field Club to Rugby, a very interesting section was examined at Hill Morton. It consists, for the most part, of brown and light-coloured sands, exposed near the London and North-Western Railway, at least 50 feet thick, often false-bedded, the laminse of deposition being very irregular, interspersed here and there with numerous small pebbles, many of which are sandstone, none very large, though all are more or less rounded, and including much flint. Amongst these were many Lias Gryphaeas (chiefly G. incurva), and some Cretaceous, Oolitic and Liassic pebbles with occasional fossils; but apparently not many ancient rocks, some of which may possibly be Carboniferous.