IV CONTENTS. 



Page 

 XI. Account of the Aurora Borealis seen in Roxburghshire on the 5lh of 



October 1830. By Mr \V. Laidlaw, Kaeside, . 252 



XII. On the Mean Temperature of Thirty-Four different places in the 



State of New York, for 1830, .... 255 



XIII. Remarks on Mr Potter's Paper " on the Specific heats of Metals." 

 By James F. VV. Johnston, A. M. &c. &c. Communicated by 

 the Author, ..... 265 



XIV. A few Remarks on an Account of the " Meeting of the Cultivators 

 of Natural Science and Medicine at Hamburgh in September 1 830, 

 by James F. W. Johnston, M. A. &c. &c." as Communicated by the 

 Author to the Edinburgh Journal of Science, New Series, No. viii. 

 p. 189. By Dr Muncke, Professor of Natural Philosophy at Hei- 

 delberg. Communicated in English by the Author, . 271 



XV. Observations on Professor Muncke's Remarks on Mr Johnston's 

 Account of the Meeting at Hamburgh. In a Letter to the Editor 

 from Mr Johnston, .... 278 



XVI. Round Sterns. By a Correspondent, . . 282 

 XVII. Observations on the Theories which have been proposed to explain 



the Vitrified Forts of Scotland. By S. Hibbert, M. D. F. R. S. 

 Ed. &c &c. • • • • • 285 



XVIII. Notice of the Discovery of very extensive Vitrified Remains at Els- 

 ness, in the Island of Sanday, Orkney. By S. Hibbert, M. D. 

 F. R. S. E., &c. In a Letter to Dr Brewster, . 309 



XIX. Some Notices regarding Vanadium. By James F. W. Johnston, 



A. M., &c Communicated by the Author, . . 318 



XX. On the Nature of the Light in the Two Rays produced by the Double 

 Refraction of Quartz. By G. B. Airy, M. A. M. G. S. Late Fel- 

 low of Trinity College ; Plumian Professor of Astronomy and Ex- 

 perimental Philosophy in the University of Cambridge ; and Fellow 

 of the Cambridge Philosophical Society, . . 324 



XXI. Description of a new Species of Lamprotornis. By John Black- 

 wall, F. L. S., &c. Communicated by the Author, . 332 



XXII. Observations on a Pamphlet, entitled, M On the Alleged Decline of 

 Science in England. By a Foreigner. London, 1831. Pp. 33." 

 Accompanied by a Preface by M. Faraday, Esq. F. R. S. &c. 334 



XXIII. A System of Geology, with a Theory of the Earth, and an explana- 

 tion of its connection with the Sacred Records. By John MacCul- 

 loch, M. D., F. R. S., &c. In Two Volumes, 8vo. Pp. 512 and 



483, • • 358 



XXIV. Register of the Barometer, Thermometer, and Rain-Gage, kept at 

 Edinburgh. By Alex. Adie, Esq. F. R. S. Edinburgh, 376 



