CONTENTS. V 



NUMBER LXXIV.— MARCH. 



Page 

 Prof. Schoenbein on the mutual Voltaic Relations of certain Per- 

 oxides, Platina, and inactive Iron 225 



Mr. G. Bird's Observations on indirect Chemical Analysis 229 



Mr. R. Rigg's further Observations on the ultimate Analysis 



of Organic Compounds 232 



Mr. R. H. Brett's Analysis of some Double Salts of Mercury 235 

 Dr. M.J. Schleiden's Observations on the Development of the 



Organization in Phaenogamous Plants 241 



Mr. J. Prideaux's Description of the Kauri or Cowdee Resin, 

 from New Zealand, with Experiments in Relation to its Em- 

 ployment in the Arts 249 



Mr. Lubbock on the Variation of the Arbitrary Constants 



in Mechanical Problems 254 



M. Ch. Matteucci's Chemical Analysis of the Substance of the 



Electrical Apparatus of the Torpedo 256 



Mr. H. F. Talbot on a new Property of the Iodide of Silver . . 258 

 Mr. J. Tovey on Professor Sylvester's Analytical Development 



of Fresnel's Optical Theory of Crystals 259 



Prof. Johnston on the Composition of certain Mineral Sub- 

 stances of Organic Origin. 1. Middletonite 261 



New Books ; — James Macfadyen's Flora of Jamaica 263 



Proceedings of the Royal, Royal Astronomical, Geological, and 



Meteorological Societies 269 



Note omitted in Dr. Schleiden's Paper 292 



On the Development of an Electric Current accompanying the 



Contraction of the muscular Fibre, by Dr. Prevost . . 293 



On Thermo-electric Phsenomena, by Ch. Matteucci 295 



On Cetrarin, by M. Herberger 296 



Action of Chlorine on ^ther 297 



Camphoric Acid 297 



On the Colours of Metals, by Mons. R. Bottiger 298 



On the Action of Protoxide of Iron on Protoxide of Copper . . 299 

 On the Gases contained in the Blood, and on Respiration, by 



M. G. Magnus 300 



On the low Temperature of January 1838, by Mr. F. Watkins 302 

 Meteorological Observations 303 



NUMBER LXXV.— APRIL. 



Dr. T. Andrews on the Action of Nitric Acid upon Bismuth 

 and other Metals 305 



Prof. Schoenbein's further Experiments on the Current Electri- 

 city excited by Chemical Tendencies, independent of ordinary 

 Chemical Action 311 



Rev. B. Powell's Notice on Repulsion by Heat, &c 317 



Mr. H. Giraud on the Nature and Properties of Teriodide of 

 Chromium 321 



