7 E 



4300 Corona and Cluomospheve. 



4320 Cliroiuosphere. General. 



Radial Extent. 



Form of Prominences and Changes in ditto. 

 Spectrum {see below, 4700). 

 Periodic Changes. 

 Photographs, Drawings. 

 4340 Moon on Corona, Baih-'s Beads, &c. 



4350 Terrestrial Phenomena during Eclipses. 



4360 Photographs of Sun [i.e., references to publislied 



reproductions). 

 Drawings of .^un (ditto ditto.) 



Spectroscopy of San and Eclipses. 

 4500 Solar spectrum (integrated sunlight). General. 



4510 Ultra-violet spectrum. 



Wavelengths, Maps, Photographs. 

 4520 Visible spectrum. 



Visual, Photographic (Wavelengths, Maps, 

 Photographs). 

 4530 Ultra-red spectrun:. 



PhotogTaphic, Bolometric (Wavelengths, 

 Maps, Photographs). 

 4540 Identification of lines with Elements. 



4550 Changes in appearance of lines (width, intensity). 



4560 Bright lines. 



4570 Distribution of energy in spectrum. 



4580 Telluric lines. 



4600 Spectroscopic researches of surface witliout eclipse 



4610 Spots. 



4620 Faculffi. 



4630 Chromosphere without eclipse. 



4640 Detei-mination of rotation. 



4650 Spectroscopic researches of Sun in eclipse. 



4660 Corona. 



4700 Chromosphere. 



4750 Physical constitution deduced fro:ii Spectroscopic 



Observations. 

 4800 Moon. General. 

 4810 Observations for position. 



4820 Constants, Dimensions (diameter and figure), mass, 



density, distance. 

 4830 Rotation (Libratiou sec aho 1730). ConfiguratioL of 



Surface, changes in ditto. 

 4840 Atmosphere. 



4850 Temperature, Radiation, Brightness, Phases. Lumiere 



Cendre'c. 

 4860 Eclipses. (.See alsu 0350). 



4870 Occultation (stars, planets, separately). (See also 0350). 



4880 Influence on Terrestrial phenomena. (See also Tides 



and F 0480). 

 4890 Photographs, Maps, Drawings (published repro- 



ductions). 



