The paper refers to a number of areas in which the lineations are related to major folds. It shows that the shapes of individual folds, the interference of neighbouring folds, and the imposition of a second generation of folds all influence the arrangement of linear structures and that lineation maps may only become explicable when the major structure has been determined.

The “space problem” in north-west Donegal is analysed; structures of country rocks and granite-quartzite contacts, together with marginal granitization, suggest that two space-forming processes operated together. The inter-relationship of these mechanical and chemical processes in Gweedore and Cloghaneely suggests a dual rhythm within Read's (1949) granite series.

The erratic rocks of the early pebble gravels are similar to those of the Oxford plateau drift, and reasons are given for concluding that they belong to the drifts of the proto-Thames, and are earlier than the southward diversion of that river by an advancing ice-sheet. Comparisons with the constituents of the later deposits of the Clacton channel are also discussed.

An outline of the geology of the Dardanelles is presented. Metasediments, chiefly marbles and schists, are cut by a granite and covered unconformably by Tertiary strata which include both sediments and volcanics. The Dardanelles is considered to be a drowned fault valley and in the south an echelon fault system is described.

Quarrying activity adjacent to the well-known intrusion of monchiquite cutting Old Red Sandstone near Usk, in Monmouthshire (originally described by W. S. Boulton, in 1911), shows that the monchiquite proper is associated with an agglomerate-filled vent. Fossiliferous blocks contained within the agglomerate (first recorded by C. R. K. Blundell) show that the volcanic activity took place not earlier than in Lower Carboniferous time; and throw light on the former extension of the Carboniferous Limestone in this area.

The term “granite” could be usefully reserved for massive or weakly oriented plutonic rocks of colour index less than 20 per cent and quartz content between 20 per cent and 40 per cent by volume. A symbolic classification of rocks meeting these requirements is presented. The various classes are based on the relative proportions of plagioclase and alkali feldspar, and sub-classes based on the ternary dominance ratio quartz-alkali feldsparplagioclase are also proposed. The symbols are simple and easily remembered. A few of the common names now in use are retained for class designations.

The granite consisted chiefly of albite, quartz, muscovite, microperthite, fluorite, and topaz; zircon was very rare. The low to high quartz transition enhanced thermal expansion and porosity. Heating was continued step-wise to 1,300°C. and caused an irreversible increase in porosity at all temperatures investigated. The changes undergone by the various minerals, separately or through interaction, were noted. Fluorite began to melt against muscovite or alkali-feldspar between 800° and 900°C. Muscovite developed brownish pleochroism at the lower, and was replaced by mullite at the higher, temperatures. The gradual melting of feldspar, the development of cleavages and cracks in quartz, and the invasion of these cracks by feldspathic glass resembled phenomena in certain xenoliths.

The conditions that produced glass when powdered granite was heated unconfined or in a bomb are described.

Miocene foraminifera from the Surat-Broach and Kathiawar regions of Western India are recorded. The suggested correlation of Miocene beds of Western India, and the stratigraphical distribution of foraminifera common to W. India, Ceylon, Indonesia, and the Middle East is indicated in 2 Tables.