Royal Society. 115 



bungen der Petrefacten- des Museums der Kdn. Pr. Bh. Univ. zu 

 Bonn, von Dr. August Goldfuss." Folio, Diisseldorf ; Arnz and Co. 

 Each Part contains 25 lithographs, and eighty pages of letterpress, 

 and the work will be completed in Five or Six Parts. 



The design of the publication is to give a systematic representation 

 and description of Petrifactions, and chiefly of those found in Germany ; 

 in so far as the author has an opportunity of obtaining specimens of 

 them. The Museum of the University of Bonn is extremely rich in 

 these objects, and is continually receiving additions. The vcork con- 

 tains no copies of figures given in other works, but original por- 

 traits of specimens, drawn under the author's inspection by a very 

 distinguished artist. The text gives the characters of the genera and 

 species, the formation in which the fossil is found, and the place from 

 whence it comes, in Latin, and a more copious description in German. 

 There are several eminent naturalists who are contributors to the 

 work ; among whom may be mentioned Count Munster, M. Von 

 Buch, M. Hoeninghaus of Crefeld, Professor Braun of Heidelberg, 

 M. Alberti, and M. Voltz. 



The arrangement adopted by the author is zoological, and begins 

 with zoophytes, and then proceeds to radiaria, annulataand shells. 

 The First and Second Parts contain the zoophytes (of which there are 

 a great many species from the transition limestone hitherto unde- 

 scribed,) and the echinites. A full examination and arrangement of 

 the corals was long a desideratum. The Third Part contains the stel- 

 lerides, encrinites, and serpulites ; together with some additional 

 specimens of corals, and among the latter, the small species found at 

 Dudley. Among the stellerides and encrinites there are several 

 very remarkable species. 



The number of species of zoophytes, of which figures are given, 

 amounts to 156, of which 147 are now for the first time described. 

 Of the echinites there are 109, and of these 59 were hitherto unde- 

 scribed. There are 50 species of encrinites, 18 of stellerides, and 78 

 of serpulites. 



The author has paid particular attention to the synonyms, with the 

 hope of putting an end to the confusion which has so long prevailed 

 from inattention to them. 



XVIII. Proceedings of Learned Societies. 



KOYAL SOCIETY. 



Nov. 17, 1831. — nr^HE following Papers were read. The first was 

 -*- entitled, " Researches in Physical Astronomy 

 — ' On the Theory of the Moon.' " By J. W. Lubbock, Esq. V.P. 

 and Treasurer of the Royal Society. 



This paper is a continuation of the author's former paper on the 

 same subject, in which he gives the developments which are required 

 in the second approximation, or that in which the square of the dis- 

 turbing force is retained. 



The author has not yet attemjjted to obtain numerical results, but 

 he considers this method of solution ecjualiy advantageous with the 

 method hitherto adopted, and that the calculation which would tend 



Q '1 to 



