Notices respecting New Books. 



closer to the north point than in an earlier part of the display. 

 The centre of the dark nucleus, however, was, from first to 

 last, west of the north, and very near to the magnetic meridian. 



From twelve o'clock nothing occurred worthy of remark : 

 the splendour of the aurora gradually declined, and at two on 

 Saturday morning it had totally vanished. 



I observed, during the whole of the night, that the streamers, 

 besides the vertical direction in which they generally shot, 

 had also a horizontal motion from east to west; so that in what- 

 ever part of the aurora a streamer was kindled, it travelled 

 slowly towards the west, or towards the left hand of a spec- 

 tator facing the north. It frequently happened that several 

 were lighted up in rapid succession, each of which was always 

 west of the preceding one. A meteoric star, which traversed 

 the aurora about ten o'clock, also fell sloping in the same 

 direction. 



Artillery Place, Woolwich, W. STURGEON. 



Jan. 10, 1831. 



N.B. On Saturday night (Jan. 8th) the aurora was again 

 visible. 1 saw it about ten o'clock. It exhibited no corusca- 

 tions, nor any flashes whatever. The only display was a broad 

 arch of light, bordering the upper edge of a black area of the 

 heavens in the north, and similarly situated to that which ap- 

 peared the preceding night. At eleven o'clock no trace of the 

 aurora was to be seen. 



XXIV. Notices respecting New Books. 



Sections and Views illustrative of Geological Phenomena. By 

 H. T. DE LA BECHE, Esq.. F.R.S. F.G.S. Treuttel and Wurtz : 

 London, 1830. 



NOTHING is so much calculated to facilitate the study of geo- 

 logy as the representation of its phenomena through the me- 

 dium of coloured views, sections and maps. 



Mr. De la Beche is known to our readers as the author of many 

 valuable contributions to the Geological department of our Journal ; 

 and the taste and skill with which he has applied his talent of draw- 

 ing to illustrate the phenomena of geology have, for some time 

 past, contributed to enrich the Transactions of the Geological So- 

 ciety of London. His large tabular and proportional view of the 

 superior, supermedial, and medial rocks, published a few years 

 since, has entitled him to the gratitude of every student in geology ; 

 and we hail the appearance of the work before us as a more exten- 

 sive contribution of a similar kind, tending, more than any other 

 publication that has yet appeared, to render easy and familiar many 

 of the most difficult and complicated phenomena of the original 



S 2 structure 



