INTRODUCTION. VII 



Engelmann, E.: LUeratur der Astronomische Nachrichten, etc., from 

 Bessel's Abhandlungen. 3 vols., 4°. 1876-7. 



[There are now three volumes, 4°, of Indices to the Astro- 

 nomische Nachrichten, which are very full, arranged both by 

 authors and subjects, and issued periodically by the editors.] 

 Exgelmann's Indices, as below, are even more full for the 

 special subjects treated. 



Subject. 

 [Comets.] 



[Saturn and Saturn's Satellites.] 

 [Refraction.] 



[Aberration, Nutation, and Precession.] 

 [Instruments.] 

 [Parallax of Stars.] 



[Fundamental Stars, Star Catalogues, and Star Charts.] 

 [Proper Motion, Variable Proper Motion, Double Stars.] 

 [Mathematics.] 



[Geodesy, Longitudes, Measurement of an Arc of Meridian.] 

 [Pendulums ; Units of Mass, etc.; Terrestrial Refraction, etc.] 

 [Miscellaneous.] 



Knobel, E. B. : Reference Catalogue of Astronomical Papers and Researches. 

 8vo. 187G. Mon. Not. R. A. S., November. 



Lauande, J.: Bibliographic Astronomique, etc. 1803. See C. T., 1806. 



London, Royal Society of : Catalogue of Scientific Papers. [1800-18G3.] 

 6 vols., 4°. 1867-1872. 



Poggendorf : Bibliographisch- Liter arisches Handworterbuch zur Geschichte 

 der Exacten Wislenschaften, etc. 2 vols., 8vo. 1863. 



Reuss, J. D.: Repertorium Commentationum, etc. Vol. V. Astronomia. 

 1804. 4°. 



Sciieibel, J. E.: Astronomische Bibliographic 1st part, 1784; 2d part, 

 1786; 3d part, with Appendices to parts 1 and 2, 1789-1798. 8vo. 



Schumacher, H. C: Catalogue des Livres Composant la Bibliothlque de 

 feu H. C. Schumacher. Part I. [Mathematics, Astronomy, 

 etc.] .1855. 8vo. pp.147. [Other valuable works of this class 

 are frequently printed by various publishers.] 



Soiincke, L. A.: Bibliotheca Mathematica. Verzeichniss der Biicher iiber 

 Astronomie, etc., welche in Deutschland und dem Auslande vora 

 Jahre 1830 bis 1854, erschienen sind. 1854. 8vo. 



St. Petersburg Academy of Sciences : Tableau general Methodique et 

 AlphabHique des Malieres contcnues dans les Publications de 

 V Academie Imperiale des Sciences de St. Petersbourg depuis sa 

 fondation. 1 ere xtartie. Langues ttrangeres. 8vo. 1874. 



