The JouftNAL of SciENCBf and the Arts, edited at the Royal Inftitution of Great Britain* Ho. XII. With Three large Plates ot the Egina Marbles, drawn and engraved by C* R. Cockerell, Efq. Price 7s 6d.CotfTZtfTS.—I. Obfemtions on the Medico-chemical Treatment of Calculous Diforders: by W. T. Brande, Efq. Sec. R. S. e%—II. Treatife on Cryptogamous and fcAgamous Vegetables, concluded*—III. On M. Stromeyer’* New Metal, Gaitnium. In a Tetter from J. G. Children, Efq. to the Editor.—IV. Description of Two Micrometers, defigned and nfed as Pyrometers.—V* An Hypothefis, to account for the variable Depth of the Ocean.—vt. On Nitric Acid: by Andrew tire, M. D. c.— VII* On the Acfctometfc*: by John and Philip Taylor.—Vlll. Pitcaiime’s Iflafrd, from the Voyages and Travels of Amafc Delano, Bofton*—»IX* The Travels of Marco Polo* a Venetian in the Thirteenth Century. Tranflated from the Italian, j with Notes: by W. Marfden, Efq. F. R. S.—X. Account of feme Experiments made on the Body of a Criminal, immediately after Execution, with Phyfiological and Praicai Obfervations : by Andrew Ure, M.D. Ate-.4—XI. Letter from an Officer in the Aric Expedition,—XIL A Journal of the Temperature of the Atttmfehere,-at Sierra Leone: by Mr. WHfcrd,—XIII. On mite Arfenic: by Dr. Pari*—XIV. On the Separation of Lime from Magfcefia, abd on feme other fubjes of Chetfycal Inquiry : by R. Phillip, Efq.—XV* On a New Acid : by J. F. Daniel, Efq. F. R. S. Sec.—XVI. On the Egina Marbles: by C. R. Cockerell, Efq.—XVII. Mining Intelligence,-—XVIII. Proceedings of Learned Societies.—XIX. Mifcellaneous Intelligence.—XX. Quarterly Lift of Publications, Meteorological Diary, Index, c.