Welsh Journals

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stone usually occurs in thin beds, and as it is a result of weathering, it is only found near the surface; when followed underground it passes gradually into unaltered limestone. Decomposed material of this type may occur sometimes as a brownish powder and sometimes as a friable rock in almost any limestone forma- tion. In the carboniferous limestone, for exam- pie, it is found along the northern edge of the South Wales Coalfield, especially about Cribarth and Penwyllt, where it has from time to time been worked. Before assuming that a deposit of rottenstone is of economic importance, many factors have to be taken into account, such as the quantity available, the fineness of grain, the ease with which the rock may be crushed, and the facilities for transport and marketing the material. The foregoing account of the natural resources of Wales is by no means exhaustive, but suffi- cient has been said to indicate their great variety, wide distribution, present important, and future possibilities. In many cases modern industrial requirements are such that material can only be quarried or mined on a large scale, and small un- dertakings cannot possibly be profitable; in other cases, especially those of the less well known substances (such as ochre, pottery clay and rot- tenstone), great care has to be taken to be as- sured of the quality and quantity that is available before any attempt is made to exploit them. In the absence of local advice, reasonable informa- tion upon possible sources of useful material can usually be secured from the Geological Survey and from institutions such as the National Museum of Wales, but so much has already been published that many of the enquiries addressed to geologists-priyate or official-could be dealt with by the enquirers themselves if they were to consult the available literature. A list of works of reference is given below, and many others are enumerated in the bibliographies given the geological publications of the National Museum of Wales. SOLON AND CRCESUS, AND OTHER GREEK ESSAYS Jtlfred Zimmern Oxford University Press, 7s. 6d. Why not "Wisdom and Wealth"? Such may be the first thoughts of a non-classical mind. Yet, as one reads the introductory chapter which transposes Greece into Modern times, one real- ises that what may be gained by the direct appeal of an English paraphrase is more than counter-balanced by the wealth of meaning LIST OF REFERENCES. Memoirs of the Geological Survey i. District Memoirs: there are recent memoirs relating to the whole of the South Wales Coal- field and adjacent district, to the North Wales Coalfield, Anglesey, and there are older publi- cations relating to North Wales, particulars of which are given in 'List of Memoirs, Maps, Sections, etc., published by the Geological Sur- vey of Great Britain,' H.M. Stationery Office. 2. Special Reports on the Mineral Resources of Great Britain those relating to Wales in- clude Vol. I, Tungsten and Manganese Ores; Vol., II, Barytes and Witherite; Vol. VI, Refrac- tory Materials Ganister and Silica-Rock; Vol. VII, Mineral Oil, etc.; Vols. IX, X, and XIII, Iron Ores; Vol. XIV, Refractory Ma- terials Fireclays; Vol. XIX, Lead and Zinc Ores in North Wales; Vol. XX, Lead and Zinc in North Cardiganshire and West Mont- gomeryshire; Vol. XXII, Lead and Zinc Ores in West Shropshire and North Wales; Vol. XXX, Copper Ores of North Wales, etc. Publications of the National Museum of Wales, each of which includes a full bibliography of works relating to the Geology of Wales. 3. 'Coal, and the Coalfields in Wales,' 1926. 4. 'The Slates of Wales,' 1927. 5. Geological Maps, their History and Develop- ment, with special reference to Wales,' 1928. 6. 'A Text-book of Geology,' by P. Lake and R. H. Rastall, London, 1927. 7. 'Coal in Great Britain,' bv Walcot Gibson, London. 1927. 8. 'Iron and Steel,' by J. H. Stansbie, London, 1907. 9. Clay and what we get from it,' by A. B. Searle, London, 1925. 10. 'Silica and the Silicates,' by J. A. Audley, London, 1921. 11. 'Hanes Plwyf Ffestiniog,' by G. J. Williams, Wrexham, 1882. REVIEWS which may lie in an unpropounded parable. In truth, the title explains the whole book. It is the work of a man who, having "mastered the discipline of thinking through some independent adventure in his own mind," and "serving the Goddess of Truth," has not "forgotten to serve his neighbour." He has travelled in "realms of gold" and returns "to sound the trumpet of a prophecy" in his own time. In the essays on "Thucydides, the Imperial- ist," "Was Greek Civilisation based on Slave