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SKETCH OF PROFESSOR S. P. LANGLEY.
409
| No. | Date. | Title or subject. | Where published. |
| 20 | July, 1877. | Possibility of Transit Observations without Personal Error. | "American Journal of Science," July, 1877. |
| 21* | April, 187.8 | Electric Time-Service. | "Harper's Monthly," April. |
| 22 | April, 1878. | Photographs and Optical Studies. | "American Journal of Science," April. |
| 23 | June, 1878. | Transit of Mercury of May 6th. | "American Journal of Science," June. |
| 24* | 1878–1879 | Six Articles on the Sun. | "Scientific American." |
| 25 | October, 1878. | Pike's Peak Observations of Eclipse of 1878. | Washington Observatory publication. |
| 26 | October, 1878. | Remarkable Groups in Lower Spectrum (A and B lines). | "Proceedings of the American Academy." |
| 27 | October, 1878. | Temperature of the Sun (Bessemer Converter, etc.) | "Proceedings of the American Academy." |
| 28 | August, 1879. | Saratoga Address as Vice-President of the American Association. | "American Association." |
| 29 | July, 1880. | Observations on Mount Etna. | "American Journal of Science." |
| 30* | July, 1880. | Wintering on Etna. | "Atlantic Monthly," July. |
| 31 | January, 1881. | The Bolometer and Radiant Energy. | "Proceedings of the American Academy." |
| 32 | March, 1881. | The Actinic Balance. | "American Journal of Science." |
| 33 | March, 1881. | Sur la Distribution de l'Énergie, etc. | "Comptes Rendus." |
| 34 | March, 1881. | Distribution de l'Énergie. | "Comptes Rendus." |
| 35 | March, 1881. | Distribution de l'Énergie. | "Annales de Chimie et de Philosophie." |
| 36 | September, 1882. | Observations du Spectre Solaire. | "Comptes Rendus." |
| 37 | October, 1882. | Sunlight and Skylight. | "Nature." See, also, "American Journal of Science." |
| 38 | December, 1882. | Transit of Venus. | "Monthly Notices of the Royal Astronomical Society." See, also, Ast. Nach. |
| 39 | March, 1883. | Selective Absorption of Solar Energy. | "American Journal of Science." |
| See, also, Weidemann's "Annalen," "Annales de Chimie et de Philosophie," London edition; and Dublin "Philosophical Magazine," for republication in full. | |||
| 40 | June, 1883. | The Spectrum of an Argand Burner. | "Science." June, 1883. |
| 41 | March, 1884. | On the Measurement of Wavelengths etc. | "American Journal of Science." |
| See, also, above-cited journals for republication in full. | |||
| 42 | September, 1884. | Amount of the Atmospheric Absorption. | "American Journal of Science." See, also, London edition, and "Dublin Philosophical Magazine." |
| 43* | September, 1884. | The New Astronomy. | "Century Mag.," September. |
| 44* | October, 1884. | The New Astronomy. | "Century Mag.," October. |
| 45* | December, 1884. | The New Astronomy. | "Century Mag.," December. |
| 46 | 1885. | Researches on Solar Heat. | "Signal-Service Professional Papers, No. 13." |
Note.—The above list omits numerous minor publications. It includes original contributions to science (the more important in italics), and articles of a popular character (marked with *).
