Vol. 57. Philosophical Magazine. March 1821 



Contents oe. Number 275. 



XXIII. New analytic Formula and Table of an increasing 

 Life Annuity; with Remarks on the Surrender of Life As- 

 surance Policies at Proprietary Offices. By Mr. J. B. Ben- 

 well, Hoxton. - - ... - page 161 



XXIV. On the Solar and Lunar Periods. By Mr. James 

 Utting, of Lynn Regis. .... iQg 



XXV. On the Division of the Circle into seventeen equal 

 Parts. 172 



XXVL Some Account of a Method which may be ap- 

 plied to the same Purposes as Sir Isaac Newton's Method 

 of Fluxions. By Mr. Thomas Tredgold. - 177 and 200 ' 



XXVII. Lunar Tables: being an Appendix to pages 24''1', 

 344, 439, of Vol. 1 1.— p. 1 7, 81 ,"578, 354, of Phil. Magazine 

 1820. 179 



XXVIII. A Table of the Sun's Right Ascension io Time 

 to every Ten Minutes of his Longitude: with the Differences 

 and Secular Variation for Jan. 1, 1801. (Obliq. of the Eclip. 

 23" 27' 57", and Sec. Var. 52"-l.) Calculated from Tay- 

 lor's Tables of Logarithms. By Mr. James Utting, 

 Lynn Regis. - - - - - - 182 , 



XXIX. On Sounds inaudible by certain Ears. By Wm. 

 Hyde Wollaston.M.D. P.R.S. - - - - 187' 



XXX. On the Constitution of aqueous Ammonia. By 

 Andrew Ure, M.D. Professor of the Andersonian Institu- 

 tion, &c. - - - - • 192 



XXXI. Right Ascension, Declination, and Passage of 

 the Meridian of Ceres j and true apparent Right Ascension 

 of Dr. Maskelyne's 36 Stars for every Day in the Year 

 1821. By the^Rev. J. Grooby. - - - 197 



XXXIII. On the Action of the Voltaic Pile upon the 

 Magnetic Needle. By M. Boisgeraud Jun. - - 203 



XXXIV. Notices respecting New Books. - - 207 ' 



XXXV. Proceedings of Learned Societies. ^ - - 222 



XXXVI. Intelligence and Miscellaneous Articles — Plati- 

 num. — TestforRarytes and Strontia.— Selenium. — Dyeing. 

 Magnetism.— Heat of Vacuum — Fine Arts. — Enharmonic 

 Organ at Calcutta.— Cicero de Republica.— Veterinary Art. 



I ScarleiFever. — Snake with twoHeads. — Potatoes.— Geo- 



I logical Inquiries. — Dangers in the Red Sea. — List of Pa- 

 tents for New Inventions. — New Comet. — Volcano in the 

 Moon. — Quere respecting Tables of Vesta. — Barometric 

 Measurement of Heights. — Meteorology, &c. &c. 228—2401 



*^* Communications for this Work, received by the Editor, 

 Pickett- Place, Temple Bar, will meet with every attention. 



RICHARD .WT» ARTHUR TAYLOR, PRINTERS, SHOE LANBj tONDON; 



