1. How are igneous distinguished from sedimentary rocks? Mention and describe some examples of each kind. 2. Define gravel, conglomerate, breccia, grit, oolite, and loam. 3. Describe a Trilobite and a Graptolite. Mention the orders of animals to which they respectively belong, and the geological formations in which they are found. 4. Mention some kinds of Shells that occur in marine, and some that are found in freshwater strata. Give the geological ages of the strata containing the shells you mention. 5. What is meant in Geology by the destroying and the reproductive effects of Tides and Currents? Give examples. 6. Name the chief formations included in the Mesozoic or Secondary series; and mention some of their characteristic fossils. PUBLISHED BY C. F. HODGSON AND SON, GOUGH SQUARE, FLEET STREET. In Svo, cloth, lettered. PROCEEDINGS of the LONDON MATHEMATICAL MA SOCIETY. Vol. I., from January 1865 to November 1866, price 10s. In half-yearly Volumes, 8vo, price 6s. 6d. each. ATHEMATICAL QUESTIONS, with their SOLUTIONS, Reprinted from the EDUCATIONAL TIMES. Edited by W. J. C. MILLER, B.A., Registrar of the General Medical Council. Of this series thirty-nine volumes have now been published, each volume containing, in addition to the papers and solutions that have appeared in the Educational Times, about the same quantity of new articles, and comprising contributions, in all branches of Mathematics, from most of the leading Mathematicians in this and other countries. New Subscribers may have any of these Volumes at Subscription price. Royal 8vo, price 78. 6d. (Used as the Text-book in the Royal Military Academy, Woolwich.) LECTURES on the ELEMENTS of APPLIED ME CHANICS. Comprising (1) Stability of Structures; (2) Strength of Materials. By MORGAN W. CROFTON, F.R.S., Professor of Mathematics and Mechanics at the Royal Military Academy. In the Press. Demy 8vo. Second Edition. (Used as the Text-book in the Royal Military Academy, Woolwich.) RACTS ON MECHANICS. 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