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Proctor, R.A. What we learn from the sum.-Newcomb, S. The problems of astronomy.-Young, C.A. The astronomical outlook.-Iles, G. The photography of the skies.-Lyell, Sir C. Uniformity in geological change.-Shaler, N.S. Rivers and valleys.-Huxley, T.H. The sea and its work.-Huxley, T.H. Earthquakes and volcanoes.