Vol. 66. Philosophical Magazine. Nov. 18^5. 

 Contents or Number 331. 



LIII. On the Variation of Density and Pressure in the interior 

 Parts of the Earth. By J. Ivory, Esq. M. A. F.R.S Page 32 



LIV. On the unequal Evolution of Heat in the Prismatic Spec- 

 trum. By Dr. T. J. Seebeck 32( 



LV. Reply to the Observations of Mr. Riddlb and Mr. Hender- 

 «0N on Mr. Burns's Mode of finding the Latitude by Double Al- 

 titudes. By James Burns, Esq 34,-: 



LVI. Report of the Transactions of the Academy of Natural 

 Sciences of Philadelphia during the Year 1824 ; submitted^Jjy the Re- 

 cording Secretary, in pursuance of a Resolution of t«e' Academy. . 3i( 



LVII. Reply to Mr. Davies's " Further Thoughts on Mr. Hera- 

 path's Demonstration." By P. Q 35^ 



LVIII. Researches on the Composition of Peridot. By L. P. 

 WALftlSTEDT 357 



hlX. A Letter from M. Ampere to M. Gerhardi on various 

 Electro-dynamic Phsenomena 26i 



LX. Memoir on a new Electro-dynamic Experiment, on its Ap- 

 plication to the Formula representing the mutual Action of the two 

 Elements of Voltaic Conductors, and on some new Results deduc ed 

 from that Formula. By M. Ampere 373 



LXI. Proceedings of Learned Societies : — Royal Society ; Lin- 

 nasan Society; Astronomical Society; Horticultural Society; Society 

 of Physicians of the United Kingdom 387—390 



LXII. Intelligence and Miscellaneous Articles : — New Demon- 

 stration cff a Problem in Trigonometry ; On Mr. Newton's Improved 

 Cross for Land-surveying ; Notice on Mr. Tredgold's Correction of 

 Dr. Ure's Calculation of the Latent Heat of Vapours ; New Survey 

 of the Zetland Islands ; On the Discovery of the A7ioplotherium com- 

 mune in the Isle of Wight, by Professor Buckland ; Formation of Ores 

 by the Action of the Atmosphere and of Volcanic Heat ; On various 

 Plants used as Tea in different Countries ; Capt. Sabine on the Ellip- 

 ticity of the Earth; List of New Patents; Meteorological Table 390 — 100 



Communications for this Work, post-paid, addressed to tlie Editor,, 

 38 Shoe-Lane, will meet with every attention. 



HICHiVRD TAYLOR, PRINTER, SHOl-LANK. LONDON. 



