ii CONTENTS. 



Page 

 XII. Observations on the Position and Revolution of the Magnetic Poles of 

 the Earth. By Christopher Hansteen, Professor of Astronomy 

 in the University of Norway, - - - 65 



XIII. On the Solar Eclipse which will happen on the 29th of November 1826 ; 

 bein» the principal results of a calculation for Edinburgh. By Mr 

 George Innes, Aberdeen, - - 71 



XIV. Observations relative to the Sound which accompanies the Aurora Bo- 



realis, - 74 



XV. Some Experiments on Coloured Flames. By H. F. Talbot, Esq. 



Communicated from the Author, - - 77 



XVI. Notice regarding the Red-breast (MotacMa rubecula, Lin. J By a Cor- 

 respondent, „- - - 82 



XVII. Account of some of the Rarer Atmospherical Phenomena observed at 

 Leith in 1825. By Mr John Coldstream. In a Letter to the Edi- 

 tor, " - - 85 



XVIII. Description of a new Register Thermometer, without any Index; 

 the principle being applicable to the most delicate Mercurial Thermome- 

 ters. By H. H. Blackadder, Esq. F. R. S. E. - 92 



XIX. Abstract of the Register of the Thermometer, Barometer, and Rain- 

 Gage, for the years 1 824 and 1825, kept at Canaan Cottage. By Alex- 

 ander Adie, Esq. F. R. S. Edinburgh. Communicated by the Au- 

 thor, - - - 94 



XX. Demonstration of Professor Leslie's Formula for determining the De- 

 crease of Heat depending on the Altitude, without " a delicate and pa- 

 tient research." Communicated by a Correspondent, - 96 

 XXI. Observations on Two Species of Pholas, found on the Sea-coast in the 

 neighbourhood of Edinburgh. By John Stark, Esq. M. W. S. Com- 



i municated by the Author, - 98 



XXII. Farther Account of the large Achromatic Refracting Telescope of Fraun- 

 hofer in the Observatory of Dorpat By Professor Struve, 105 



XXIII. Observations on some Sulphurets. By M. Gay-Lussac, 110 



XXIV. On the Effects of Time in Modifying Anomalous Cases of Vision, with 

 regard to Colours. By George Harvey, Esq. F. R. S. Lond. and 

 Edin., F. G. S. &c. In a Letter to the Editor, - 114 



XXV. On the Reciprocal Decomposition of Bodies. By M. Gay-Lussac, 116 



XXVI. On an extremely Cheap and Delicate Hydrostatic Balance. By Wil- 

 liam Ritchie, A. M., Rector of Tain Academy. Communicated by 



the Author, - - - 118 



XXVI I. Note concerning the Presence of Anhydrous Persulphate of Iron in 

 the residue of the concentration of Sulphuric Acid. By MM. Bussy 

 and Lecanu, - - 120 



XXVIII. On the Refractive Power of the Two New Fluids in Minerals,with Ad- 

 ditional Observations on the Nature and Properties of these Substances. 

 By David Brewster, LL. D. F. R. S. Lond., Sec. R. S. Edin., and 

 Corresponding Member of .he Academy of Sciences at Paris. 122 



XXIX. On the Composition of the Native Phosphates and Arscniates of Lead, 



by F. Wohler. - - 136 



XXX. On a new Photometer, founded on the Principles of Bouguer. By 



William Ritchie, A. M. Rector of Tain Academy, - 139 



11 



