Tilestone, any thinly laminated sand- Trachyte (Gr. trachys, rough), a variety Transition, as applied in classification, Trap-rocks (Swedish, trappa, a stair), Tremadoc slates, upper Cambrian, 70. Trilobites, characteristic silurian crus- Trough, basin, or syncline of stratified Tuff, or tufa (Ital. tufo, Gr. tophos), ori- UNCONFORMABLE, unconformability a- Unstratified rocks, synonymous with VALLEYS of erosion, 18. Vancouver Island, coal of, 132. Veins, in stratified and unstratified Vesicular or cellular, like lava, 35. Volcanic rocks, description and varieties Volcanoes (Lat. Vulcanus, the god of WACKE (Ger.), a term applied to all soft earthy varieties of trap, whether tu- Warp, a local term for marine silt, 154. Wenlock rocks, the middle series of silu- Whinstone, Whin, a Scottish or Saxon XIPHODON, tertiary mammal, 160. ZAMITES, fossil plants of the trias and Zechstein (Ger., mine-stone), a term ap- Zosterites, marine plant, figured, 83. THE END. 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These 'Outlines'-in many respects an epitome of the 'Elements'— are carefully prepared to meet the wants of beginners. The arrangement is the same as in the Author's larger works. Minute details are avoided, the broad outlines are graphically presented, the accentuation marked, and the most recent changes in political geography exhibited. IV. NINETEENTH THOUSAND. FIRST STEPS IN GEOGRAPHY. 18mo, pp. 56, price 4d. Sewed, or 6d. in Cloth. 2 W. BLACKWOOD AND SONS' DR MACKAY'S ELEMENTARY GEOGRAPHIES. OPINIONS. Sir RODERICK IMPEY MURCHISON, K.C.B., President of the Royal Geographical Society, in his Anniversary Address, 1864, says of the 'Elements':-"Among the elementary publications, I may direct attention to a useful little work, by the Rev. Alexander Mackay, entitled 'Elements of Modern Geography' (Blackwood and Sons). In a former Address I ventured to commend the Manual of Geography' by the same author; and the present production is an improved and careful epitome of that work, which can be recommended as a text-book to be used in the educational establishments of the country. I cannot but admire the assiduity and research displayed in the preparation of this elementary treatise." A. KEITH JOHNSTON, LL.D. F.R.S.E. F.R.G.S., H.M. Geographer for Scotland, Author of the Physical Atlas,' &c. &c.-"There is no work of the kind, in the English or any other language, known to me, which comes so near my ideal of perfection in a school-book, on the important subject of which it treats. In arrangement, style, selection of matter, clearness, and thorough accuracy of statement, it is without a rival; and knowing, as I do, the vast amount of labour and research you bestowed on its production, I trust it will be so appreciated as to insure, by an extensive sale, a well-merited reward." 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"We are glad to be able very strongly to commend the 'Elements' to the attention of teachers, as one of the best, one of the very good school-books of geography in existence. We can recommend it on account of its fulness, yet within manageable limits. Its information is the most recent. We have tested its accuracy, by comparison with independent sources of information within our reach, and that in connection with our own country, with Denmark, and the United States: we have in no case found any serious discrepancy. To accuracy and freshness of matter it adds terseness of style and clearness of arrangement,—the latter much aided by varieties of typography." |