VIII 



INTRODUCTION. 



Struve, Otto v.: Catalogus Librorum in Blbliotheca Speculae Pulcovensis. 

 8vo. 1858. 



Weidler, J. F.: Bibliographia Astronomica , etc. 1755. 8vo. 



Weller : Cometen- Liter atur in the Anzeiger fur Kundeder Deutschen Vor. 

 zeit. 1857. No. 10, p. 321 ; No. 11, p. 359. 



Wolf, R.: Sonnenflechcn Literatur in the Astronomische Mittheilungen. 

 : Handbuch der Mathematik, Astronomie, etc. 2 vols , Svo. 1872. 



Young, Thos.: A Course of Lectures on Natural Philosophy. 2 vols. 

 1807. 4°. Vol. ii, p. 87. 



PRINCIPAL ABBREVIATIONS USED IN THE REFERENCES OF THE 

 PRESENT WORK.* 



Abbreviation. 



Work referred to. 



Am. Ass. Adv. Sci. 



Am. Jour. Sci. 



A. N. 

 Ast. Jour. 



B. A. A. S. 



Bern. 



B. J. 



a r. 

 a t. 



Mem. A. A. S. 



Mem. R. A. S. 

 Mem. Soc. Spet. Ital. 

 Mon. Not. R. A. S 



M. M. 



Paris. 



Phil. Mag. 



Proc. A. A. S. 



Proc. R. S. 

 P. T. 



p.t. 



Quar. Jour. Sci. 



Sid. Mess. 



V. J. S. 



Proceedings American Association for the Advance- 

 ment of Science. 



Silliman's American Journal Science and Arts. 



Astronomische Nachrichten. 



Gould's Astronomical Journal. 



Eeports British Association for the Advancement ot 

 Science. 



Mitt. d. Naturforsch. Gesell. in Bern. 



Bode's [or Berliner] Jahrbuch. 



Comptes Rendus de l'Acad^mie Royale des Sciences. 



Connaissance des Terns. 



Memoirs American Academy of Arts and Sciences. 

 [Boston.] 



Memoirs of the Royal Astronomical Society. 



Memorie della Societa degli Spettroscopisti Italiani. 



Monthly Notices of the Royal Astronomical Society. 



Melanges Mathematiques et Astronomiques. 



Histoire [ou M6moires] de l'Academie Royale des 

 Sciences. 



London, Edinhurg and Dublin Philosophical Maga- 

 zine. 



Proceedings American Academy of Arts and Sciences. 

 [Boston.] 



Proceedings of the Royal Society of London. 



Philosophical Transactions of the Royal Society of 

 London. 



Philosophical Transactions of the Royal Society of 

 London — abridgment to 1S00, by Huttok. 



Quarterly Journal of Science. 



Mitchel's Siderial Messenger. 



Vierteljahrsschrift der Astron. Gesell. [Leipzig.] 



* Those used and not given here will be easily understood. 



