167 
Utrecht. Provinciaal Utrechtsch Genootschap ‘van Kunsten en 
Wetenschappen: 
— Aanteekeningen van het verhandelde in de sectie-vergaderingen, 1909. 
— Verslag van het verhandelde in de: algemeene vergadering;! 1909. 
Wrarschau. Société scientifique: 
— Comptes rendus (Sprawozdania), rok 1, 1908, zeszyt 6—8; rok 2, 
1909, zeszyt 2—9. . 
— Prace, No 1. 
Washington. Carnegie Foundation for the Advancement of 
Teaching: 
— Annual Report, 4, 1909. 
Carnegie Institution: 
— Annual Report of the Mount Wilson Solar Observatory, 1908. 
— Contributions from the Solar Observatory Mt. Wilson, California, 
No 29, 31—42, 44. 
— Year Book, No 6, 1908. 
— Publications, No 73 (J, I), 85, 90, 102, 103, 104, 107, 108, 110, 111, 
ie oe gl bss BR: Ss 2 we ' 
Coast and Geodetic Survey: 
— Geodesy. The figure of the earth and isostasy Path measurements in 
‘the United States, by J. F. Hayford. 
- — Precise levelling in the United States, 1903-1907. 
— Report of the Superintendent, 1907 —1908. 
Department of Agriculture: 
— Yearbook, 1908. 
Department of Commerce and Labor (Bureau of Standards): 
— Bulletin, vol. 5, No 3, 4; vol. 6, No 1, 2. 
Nautical Almanac Office: 
— The American Ephemeris and Nautical Almanac 1912. 
- — The Star List of the American Ephemeris for 1909. 
— 
Naval Observatory: 
— Synopsis of the Report for 1909. 
Patent Office: 
— Official Gazette, vol. 143, No 2. 
Philosophical Society: 
— Bulletin, vol. XV, pp. 103—131. 
Smithsonian Institution: 
— Annual Report, 1907. 
— Smithsonian Mathematical Tables. Hyperbolic functions, prepared by 
G. F. Becker and E. van Orstrand. 
