PHILOSOPHICAL SOCIETY OF WASHINGTON. 99 



been deduced, refers to all places in periodical and other litera- 

 ture where the particular comets are treated of, or where observa- 

 tions are given, aud is a monument of industry and exactness, 



Weller: G ometen- Liter atur ; in the Anzeiger fiir Kiinde der 

 Deutschen Vorzeit, 1857, No. 10, p. 321; No. 11, p. 859. 

 This work, which I have never seen, refers to the comets of 

 1556, 1570, and 1577. 



St, Petersburg Academy of Sciences : Tableau general me- 

 thodique et alphabetique des Matieres contenues dans les Pub- 

 lications de V Academic Imperiale dcs Sciences de St. Feters- 

 bourg depuis sa fondation V p)(irtie. Langues etrangeres. 

 8vo. 1874. 



The subject "Astronomy" is quite full in this list, as might be 

 •expected, and it is arranged alphabetically by authors. 



Belgian Academy op Sciences : Bibliographie Academique. 



1875. 8vo. 

 This volume is devoted to bibliography and biography. Each 

 member of the Academy is mentioned separately and a brief 

 sketch of his life given, and following this is a list of his papers; 

 firat, those published in the volumes of the Academy ; and sec- 

 ond, those published elsewhere. The first list is complete; the 

 second quite full. It includes a number of astronomical papers. 



Engelmann, R.: Literaiur der Astronomische Nachrichten, etc. 



In his recent edition of the selected works of Bessel, Dr. 

 Engelmann has collected, after each separate subject, a list of 

 all the publications on this subject which have appeared in the 

 Astronomische Nachrichten up to the present date, the whole 

 constituting a topical ind(!X of high value. There are now 

 three volumes 4to. of Indices to the Astronomische Nachricten, 

 yery full, arranged both by authors and subjects. 



The volume and page of Engelmann's Bessel's Abhand- 

 liingen, where these lists are printed, are given below. 



Subject. 



Comets. 



Saturn and Saturn's satellites. 



Refraction. 



Aberration, Nutation, aud Precession. 



Parallax of Stars. 



Fundamental Stars; Star Catalogues and Star Charts. 



Mathematics. 



Proper Motion, variable proper motion, Double Stars, 

 Sirius' companion, etc. 



Geodesy; Longitu^le-^; measurement of an arc of meridian. 



Pendulums, etc.; Units of mass, etc.; Terrestrial Refrac- 

 tion, etc. 

 III. 489. Miscellaneous. 



* [I may say here that the bibliography of mathematics in general is 

 ▼ery f all, but its consideration is beyond my present purpose.] 



