Summary Honestones from York and certain other early mediaeval sites prove on petrographical examination to include the following rook types: quartz-mica granulite, quartz-muscovite-chlorite-schist, metamorphosed siltstone, silty sandstone, chloritic siltstone, mudstone, phyllite, micaceous sandstone and siltstone, glauconitic sandstone. The metamorphic granulites and related rocks are similar to the schist hones of Mr. G. C. Dunning. The possibility of a source in Aberdeenshire is suggested, perhaps indicating an ancient trade route with the north. Typical phyllites and siltstones from the Lower Palaeozoic rocks of NW. England and the Southern Uplands were probably obtained from the local glacial drift. The sandstones include some Yorkshire Millstone Grit types, while the glauconitic sandstone is undoubtedly from the Greensand of SE. England. It is noted that all the honestones consist of rocks made up of small angular quartz grains set in a softer matrix.

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Fifty-five samples of British rocks of restricted petrological type, namely quartz-dolerite, were examined petrographically and by mechanical testing. No general correlation was found between mineral content or grain-size and test results. Considerable correlation exists, however, between the test values and geological occurrence; the specimens from the Whin Sill generally yield test results superior to those from Scottish Permo-Carboniferous sills, whereas samples from Scottish dykes of I'ermo-Carboniferous and Tertiary age respectively form intermediate groups.