C8 CATALOGUE OF EXHIBITS. 



3. Comparison of the Potsdam and the Harvard Photo- 

 metric measures of the variable stars U Vulpeculae and 

 S T Cygni. 



4. Photographic Method of Discovering Variable Stars of 

 Short Period. 



5. Meteors photographed on November 14, 1898, show- 

 ing radiant point. 



6. Distribution of Stars of Type V. 



7. Specimens of Stellar Spectra, Types I., I., III. 



8. Specimens of Stellar Spectra, Types III., IV., V. 



9. Specimens of Stellar Spectra, peculiar. 



10. Method of converting Prismatic into Normal Spectra. 



11. Method of converting Prismatic into Normal Spectra. 



12. The New Planet Eros (433); Bruce Telescope. 



13. The New Planet Eros (433); Bruce Telescope. 



14. Path of Eros in 1 894, showing positions of images found 

 on Harvard photographs. 



15. The New Star in Sagittarius. 



16. New Satellite of Saturn. 



17. New 12-inch Horizontal Photometer ; exterior. 



18. New 12-inch Horizontal Photometer; interior. 



19. Ascent of El Misti. 



20. Interior of crater of El Misti. 



21. Stations on El Misti ; elevation 15,700 and 19,200 feet. 



Lick Observatory, California ; James E. Keeler, director. 



22. Campbell's photographs of the total solar eclipse of 

 January 21, 1898. 



23. Photographs of the Orion Nebula taken with the Cross- 

 ley reflector. 



24. Enlargements of Campbell's photographs of star spectra. 



Warner and Swazey, Cleveland, Ohio. 



25. New Model Telescopic gun sights. 



26. Sextant. 



27. Latest design of 2-inch Alt-Azimuth Telescope. 



Columbia University Observatory ; J. K. Rees, director. 



28. Graphical representation of the variation of latitude at 

 New York City from 1893 to 1899. 



