Vol. 57. 



Philosophical Magazine. 



Jan-. 1851.1 



Contents or Number 273^ 



Page 



I. On the discordant Opinions delivered by the Chemists 

 who gave Evidence on the 1 rials of the Insurance Question 

 of Severn, King and Co. versus the Fire Offices. ' By M, 

 RiCARDO, Esq. .---,.<_ 



II. On the PyroHgnecrtis Acid, its Manufacture and Uses. 

 By Dr. Wilkinson. - - - -- . -10i 



III. On the Magnitude of the Year. ByMr. Yeates. - 15 



IV. Account of the Voyage of Discovery and Circumna- 

 vigation, performed in 1818, 1819, and 1820, by Capt. Frey- 

 ciNET, Commander of the French Corvette Urania. - 20 



V. A Table of the Sun's Right Ascension to every Ten 

 Minutes of his Longitude, with the Differences and Secular 

 Variation for January 1, 1801. (Obliq. Eclip. 23« 27' 57", 



I and Sec.Var. 52"- 1.) By Mr. James Utting, Lynn Regis. 28 



V. Answer of Mr. P. Nicholson toMr.HoLDREDonMr. 

 N.'s Work on Involution and Evolution. - - - 33 



VI. On the Electro-Magnetic Experiments of MM. 

 CErjted and Ampere. By Mr. H.^^tchett, - - - 40 



VII. On the Catenary Curve. By a Correspondent. - 50 



VIII. On the CoJnpressibility of Watqr. By Jacob Per- 

 kins, Esq. Communicated by the late Right tlon. Sir 



'jo^sEPH Banks, Bart. G.C.B.P.R.S. - - - , - 52 ; 



IX. Notices respecting New Books - - -56 



r 



X. Proceedings of Learned Societies - - - 65 

 \. 



XI. Intelligence and Miscellaneous Articles :*-OIl Gas. 

 On the Sol^ir Spots. — Rhubarb. — Magnetism. — Meteoric 

 Stone. — Antidote .against Corrosive Sublimate. — The 

 French Flock of Cashmire Goats. — Reduction of Muriate 



I (Chloride) of Silver.— Tha Statue of Memnon. — Antarctic 

 Continent. — Arctic Land Expedition. — Newly discovered 

 Islands.— MammoUi Gourd.— Chain Cables usefulConduc- 



I tors of Lightning. - - • . . -67 — 80 



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

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



HIOHAKD AND ARTHUR l^YtOB, PRINTERS, SH05 LANU^ LONIMJ.V 



