98 BULLETIN OF THE 



Royal Society of London: Catalogue of Scientijic Papers 

 (1800-1863). 6 vols. 4to. 1867-1872. 

 This catalogue, which originated in a communication of Prof. 

 Henry to the British Association in 1855, is intended to serve 

 as an Index to the Titles and Dates of Scientific Papers contained 

 in the Transactions of Societies, Journals, and other Periodical 

 works which have been published from the beginning of the pre- 

 sent century to the end of 1863. No separate publications, as 

 bopks, are included. It is unnecessary to say that it is practically 

 indispensable to any course of reading. It is to be continued. 



Darboux and Houel: Bulletin des Sciences Mathematiques et 

 Astronomiques. Periodical. 8vo. 

 This contains the full titles of books and memoirs on mathe- 

 matics and astronomy, and in many cases most complete abstracts 

 of them. It is published serially and still continues. 



Pooqendorf : BiograpJiisch-Literarisches Handworterbuch zur 

 Geschichte der exacten Wlssenschaften, etc. 2 vols. 8vo, 

 1863. 



This work is arranged alphabetically by authors, and is intended 

 to cover all the important publications of each author, whether 

 published separately or in the Transactions of Societies. Fur- 

 ther, it is intended to cover the publications of the ancients as 

 well as of the moderns. It is extremely valuable as an extension 

 of the Royal Society's Catalogue, and as an independent test 

 upon it. If but one work of astronomical bibliography can be 

 owned, this is undoubtedly the one of most general value. 



Wolf, R. : Sonnenjlecken — Literatur, etc. 



In the Astronomische Mittheilungen of Wolf a regular record 

 of the literature of sun-spots is kept up, and when this is event- 

 ually brought together, a very little labor will make it complete. 



Wolf's Handhuch der Matheviatik, Astronomic, etc., 2 vols. 

 8vo., 1872, contains also a great number of references an-anged 

 by subjects. 



Carl, Ph.: Die Principien der Astronomische Instrumenten 

 Kunde. 8vo. 1863. 

 As an Appendix to his Principien, p. 161, Carl gives an 

 exhaustive catalogue of memoirs, etc. upon micrometers and 

 micrometer screws, of high importance. This is arranged alpha- 

 betically by authors. 



Carl : Repertorium der Cometen — Astronomic. 8vo. Munich, 

 1864. pp. 377. 

 This work contains an account of every comet up to 1864, and 

 besides giving the various systems of elements, etc., which have 



