CONTENTS. 



On some netvlj^ iliscovived rcmarlahh' Pro'peities of the Prot- 

 oxide, Oxidized Sidplnirct, and Metallic Fc-wder of Platimmi. 

 By Professoi- Dcebereiner 289 



On the Parallax of a Lyra:. By John Pond, Esq. Astrono- 

 mer Royal, F.R.S. 292 



0« a 7ie-iV Uteam-Engiiie Governor. By Mr. Preuss 297 



A71 Account of so?ne JSlectro-magfietic Combinations, for exhi- 

 biting Thermo-electric Phtvnomena, invented by Mr. James 

 Marsh of Wookvich; ivifh Exjierimeiits on the same. By 

 Peter Barlow, Esq. F.R.S. 321 



On the Caloric of Gases and FajMtirs, by M. PoissoN : wit/i Ob- 

 servations by John Herapath, Esq 328 



On the QjuidratJa-e of the Circle. By Mr. J. Snart . 338 



An Examination of certain Minerals. By Augustus Arf- 

 AVEDSON 355 



On the Origin and Production of Matter, and on its alleged 

 Infinite Divisibility 360 



On the Petrifactions of Osteriioeddigen, near Magdeburg. By 

 Professor Germar 367 



Remarks on some of the American Animals of the Gciius Felis, 

 particularly on the Jaguar, Felis Onca Linn. By T. S- 

 Traill, M.D. F.R.S.E. S^-c 372 



On the Adjustment of the Line of Collimation of the Transit 

 Instrument 377 



Plantcc rarce Sttcculentce ,- a Desaiption of some rare Succulent 

 Plants, by A. H. Haworth, Esq. F. L. S. 4'c. . . . 380 



On the Cultivatioti of the English Cranberry (Oxycocciis pa- 

 lustris) in diy Beds. By Mr. Thomas Milne . . 382 



T7ie Specific Characters of several undescribed Shells. By 

 W. SwAiNSON, Esq. F.R. 8f L.S. S^-c 401 



On the Management of Caulifoxver Plants, to secure good Pro- 

 duce during the Winter. 1?// Mr. Geo. CocKBURN 404 



Description of a Method of protecting Caid'floxver and other 

 tender Plants during Winter. By Mr. J. Drummond 405 



Method of defending Ships and Fortifications against Cannon 

 Balls. By Lewis Gompertz, Esq , 407 



On Fluid Chlmine. 2??/ Mr. Faraday 413 



On the Condensation of several Gases into Liquids. By Mr. 

 Faraday 414 



An Examination of the green Garnet ofSala. By B. G. Bred- 

 berg 423 



Observations on Suspension Chain Bridges,- "with an impro-ced 

 MetJiod cf forming the supporting Chains or Rods: accom- 

 panied ivith a Drwdoing. By Mr. J. Seaward . . 425 



An Account of a nrxv Genus o/'Narcissea^, allied to the Genus 

 Ajax (fSalislnny. By A. T L I Fawouth, Esq. F.L.S. S,t. A\0 



