_Classification of Clouds for the Weather Observers of the Hydrographic Office._ Hydrographic Office, Bureau of Navigation, Department of the Navy, Washington, D. C. 1897. Sheet of twelve colored views. Price 40 cents. In book form, with descriptive text, $1.00. An excellent set of cloud views, classified according to the _International Nomenclature_. The text describes the various cloud forms and shows their value as weather prognostics. An attractive addition to the furnishings of a schoolroom. _Selected List of Cloud Photographs and Lantern Slides._ Consists of twenty-eight photographs, and the same number of lantern slides, of the typical cloud forms, selected by the present writer from the collection in the Physical Geography Laboratory of Harvard University. The photographs (20 cents each, mounted) and slides (40 cents each) may be purchased of E. E. Howell, 612 17th Street, N. W., Washington, D. C. A description of these views was published in the _American Meteorological Journal_ for July, 1894 (Boston, Mass., Ginn & Company). _Photographs._ Photographs of miscellaneous meteorological phenomena, such as snow and ice storms, damage by storm-waves or high winds, wind-blown trees, lightning, etc., may often be purchased of local dealers. They add to the attractiveness of a schoolroom and furnish excellent illustrations in teaching. _H._ GENERAL. The following _Bulletins_ of the Weather Bureau may be found useful as reference books: No. 1. _Notes on the Climate and Meteorology of Death Valley, California._ MARK W. HARRINGTON. 8vo. 1892. Pp. 50. No. 8. _Report on the Climatology of the Cotton Plant._ P. H. MELL. 8vo. 1893. Pp. 68. No. 10. _The Climate of Chicago._ H. A. HAZEN. 8vo. 1893. Pp. 137. No. 11. _Report of the International Meteorological Congress held at Chicago, III., Aug. 21-24, 1893._ 8vo. Pt. I, 1894, pp. 206. Pt. II, 1895, pp. 583. Pt. III, 1896, pp. 772. Pt. IV, not yet issued. No. 15. _Protection from Lightning._ ALEXANDER MCADIE. 8vo. 1895. Pp. 26. No. 17. _The Work of the Weather Bureau in Connection with the Rivers of the United States._ WILLIS L. MOORE. 8vo. 1896. Pp. 106. No. 19. _Report on the Relative Humidity of Southern New England and Other Localities._ A. J. HENRY. 8vo. 1896. Pp. 23. No. 20. _Storms, Storm Tracks and Weather Forecasting._ FRANK H. BIGELOW. 8vo. 1897. Pp. 87. No. 21. _Climate, of Cuba._ Also, _A Note on the Weather of Manila._ W. F. R. PHILLIPS. 8vo. 1898. Pp. 23. No. 23. _Frost: When to expect it and how to lessen the Injury therefrom._ W. H. HAMMON. 8vo. 1899. Pp. 37. No. 25. _Weather Forecasting: Some Facts Historical, Practical, and Theoretical._ WILLIS L. MOORE. 8vo. 1899. Pp. 16. No. 26. _Lightning and the Electricity of the Air._ In two parts. A. G. MCADIE and A. J. HENRY. 8vo. 1899. Pp. 74. The following miscellaneous publications of the Weather Bureau may also prove of value.