[ 224. ] 



XXIX. Notices respecting New Books. 



Tables of Simple Minerals, Rocks, and Shells ; "with Local Catalogues 

 of Species, For the use of the Students of Natural History in the 

 Belfast Academy. By James Bryce, Jun. A.B., Master of the 

 Mathematical School in the Belfast Academy, and Member of the 

 Society of Natural History of Belfast. Belfast, 1831. Post 8vo, 

 pp. 32, interleaved blank. 



THESE Tables, we are informed by the compiler (a notice by 

 whom on the discovery of the plesiosaurus in Ireland was 

 given in the Phil, Mag. and Annals for May last), in the Preface, 

 are printed for the use of the students of Natural History in the 

 Belfast Academy. The following is a list of them and of the au- 

 thorities on which they are founded : — 



Table of Simple Minerals, in which the classification published 

 in the " Conversations on Mineralogy" has been adopted, with a 

 few alterations and additions; the synonymes of English authors 

 added in notes : Appendix, I. Minerals analysed, but not placed 

 in the system, including several new species discovered by Mr. 

 P. Doran, and analysed and named by Dr. Thomson, (Antrimolite, 

 Erinite, Harringtonite, Lehuntite, Mornite, and Stellite ?) : II. Mi- 

 nerals not analj'sed — Table of Rocks, with synonymes in notes — 

 Tabular View of the Classification of Shells, from Lamarck — 

 Lists of the Simple Minerals and Rocks of the Counties of Down, 

 Antrim, and Derry, drawn up from the observations of Dr. Hamil- 

 ton, Dr. Berger, Sir Charles Giesecke, and of Mr. Bryce himself — 

 Shells of the same counties, those of Down and Antrim from a 

 catalogue by Dr. Magee and Mr. Hyndman, and Capt. Brown's 

 paper on Irish Testacea, and including a copious list of those found 

 in a dead state at the New Dock of Belfast by Dr. William Magee 

 — Fossils of the same counties : this list, it is stated, " must be re- 

 garded as much more incomplete than any of the others. The se- 

 condary Rocks which exist in the district are not, as far as they 

 have yet been examined, productive of a great variety of Fossils; 

 and many of those which have been discovered are in so imperfect 

 a state, that it is very difficult to determine their specific names. 

 Those identified with known species are named from Sowerby's 

 Mineral Conchology." 



Om Compassets Misviisniug. The Variatioyi of the Compass. Co- 

 penhagen, 1831, Danish and English. 8vo, pp. 10, two Maps, 

 one folding Table. 



The following extract from this memoir will explain the views of 

 the author respecting the variation of the Needle; it gives the tenour, 

 he informs us, of his theory on that subject, delivered in two other 

 pamphlets, entitled " The Construction of the World," and, " The 

 Relation of the Magnet to its Poles." 



" There are two magnetic poles in each hemisphere, of which 

 however but one is moveable, the other being the cosmical pole of 

 the hemisphere. As to the moveable poles they are diametrically 



opposite 



