ADVERTISEMENT. Ill 
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8. On Secondary Enlargements of Mineral Fragments in Certain Rocks, by R. D. Irving and C, 
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10. On the Cambrian Faunas of North America. Preliminary studies, by Charles Doolittle Wal- 
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14. The Electrical and Magnetic Properties of the Iron-Carburets, by Carl Barus and Vincent 
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20. Contributions to the Mineralogy of the Rocky Mountains, by Whitman Cross and W. F. Hille- 
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22. On New Cretaceous Fossils from California, by Charles A. White. 1885. 8°. 25 pp. 5pl. 
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28. The Gabbros and Associated Hornblende Rocks occurring in the Neighborhood of Baltimore, 
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29. On the Fresh-water Invertebrates of the North American Jurassic, by Charles A. White. 1886. 
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30. Second Contribution to the Studies on the Cambrian Faunas of North America, by Charles 
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31. Systematic Review of our Present Knowledge of Fossil Insects, including Myriapods and 
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34. On the relation of the Laramie Molluscan Fauna to that of the succeeding Fresh-water Eocene 
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35. Physical Properties of the Iron-Carburets, by Carl Barus and Vincent Strouhal. 1886. 8°. 
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