408 



THE POPULAR SCIENCE MONTHLY 



ley's which should be referred to here, were it not for limited space. 

 His observations on the moon's heat ; on the solar eclipse of 1878 (at 

 the summit of Pike's Peak) ; his direct comparison of the sun with 

 the molten metal of a Bessemer converter ; his investigations at Mount 

 Etna, Pike's Peak, and Mount Whitney, on the conditions of vision at 

 great altitudes, all deserve more than this brief notice. 



His published scientific papers are very numerous. A list of the 

 more important of these follows this article. There are forty-six sepa- 

 rate papers in the years from 1869 to 1885. Besides these, the maga- 

 zines have contained many more popular articles ; and his courses of 

 lectures at the Lowell Institute, the Peabody Institute, and elsewhere, 

 have been most successful. 



Professor Langley is a member of the National Academy of Sci- 

 ences and of numerous American and foreign bodies, and has received 

 the recognition of honorary degrees from various universities. 



PEOFESSIONAL AND OTIIER PAPERS BY S. P. LANGLEY, IN CHRONO- 

 LOGICAL ORDER. 



No. 

 1 



2 

 3 

 4 



5 



6 



9* 



10* 

 11* 

 12* 

 13 



14 

 15 

 16 



17 



18* 

 19 



Date. 



August, 1869 



December, 1869., 

 January, 1871 .. . 

 February, 1871. . 



April, 1871 



September, 1872. 



Title or subject. 



August, 1873 



February, 1874. . 



Aug. & Sept., 1874 



September, 1874, 

 December, 1874.. 



March, 1875 



March, 1875 



Eclipse of August, 1869 



Proposed Plan of Time-Service . . . 



Eclipse Expedition of 1870 



A New Form of Solar Eyepiece . . . 



Observations on Eclipse of 1870.. . 



American System of Electric Sig- 

 nals 



The Solar Photosphere 



Minute Structure of Photosphere . . 



External Aspects of Sun, with Typi- 

 cal Sun-Spot Plate 



March, 1875 



September, 1875. 

 September, 1875. 



November, 1876.. 



April, 1877. 

 May, 1877. 



Photosphere and Sun-Spots 



Transit of Venus 



Sources of Solar Heat (lecture). . . . 



Comparison of Theory and Obser- 

 vation 



See, also, Memorie degli Spettrosco- 

 pisti, Typical Sun-Spot Plate with 

 each Memoir. 



Temperature Relative des, etc 



Radiations Superficiclles de Soleil. . 



The Solar Atmosphere 



Effect of Sun-Spots on Terrestrial 

 Climate 



The first " Popular Scientific Trea- 

 tise" 



Nouvelle Methode, etc 



See, also, " American Journal of 

 Science," August, 1877. 



Where published. 



"United States Coast Survey 

 Reports." 



Pittsburg. 



"Nature," January, 1871. 



" Franklin Institute Journal," 

 February. 1871. 



" United States Census Re- 

 ports." 



"American Journal of Sci- 

 ence," November, 1872. 



' Proceedings of the American 

 Association," 18*73. 



"American Journal of Sci- 

 ence," February, 1874. 



"Franklin Institute Journal," 



August, 1874. 

 " Popular Science," September. 

 " Popular Science," December. 

 "New York Tribune," Mar. 10. 



"American Journal of Sci- 

 ence," March. 



"ComptesRendus," Mar., 1875. 

 "ComptesRendus," Sept., 1875. 

 " American Journal of Sci- 

 ence," 1875. 



"Royal Astronomical Society 

 Notices," November. 



" Popular Science," April, 1877. 

 " Comptes Rendus," May, 1877. 



