CONTENTS. 



Obscrx'ations ujwn the Cadmia foxind at the Ancram Iron- Mot- As 

 ill Columbia Counti;^ Nexo York, erroneously supposed to he a 



ncic Mineral. i?j/ Wm. H. Keating 115 



On a Planetary Analogy ; or a Lais of Motion pervading and 



connecting all the Planetary Orbits. By Mr. J. Utting 119 



State of the TJiermometer at Smyrna for every Day in the 



Year \S20. Commtmicated by Dr. T.Yorstbr. . . 121 



Notice of the Fi/sion of Plumbago, or Graj)hite, {commonly 



called Blade Lead,) by Professor ^\\AAm\^ . . . . IS-t 



Experiments upon Diamond, Anthracite, and Plumbago, with 



the compound Blo-jcpipe : by P?ofessor SiLhiMA^ . . ISl 



A New Plan of Tunnelling, calculated for opening a Roadrvay 



under the Thames. By M. J. Brunel, Esq. C.E. F.R.S. 1 39 



List of the Occultations of the FixedStars. By M. Inghirami 



161, 278,378 

 On Cadmium, ^j/ William Herapath, ^sy. . . . 166 

 On the Transformation of Functions. By Mr. P. Nicholson 



168 



On the Changes which have taken place in the Declination of 



some of the ]}rincij)al Fixed Stars. By John Pond, Esq. 



Astronomer Royal, F.R.S. 175 



Chemical Researches by Z);. Friedemann Gobel of Jena 187 



On the Identity of certain General Laws which have been 



observed to regidate the Natural Distrilmtion of Insects and 



Fungi. By W. S. MacLeay, Esq. M.A. F.L.S. 192, 255 



A few Observations on the Natural Distribution of animated 



Nature 200, 274 



On the Firing of Gunpowder by Fidminating Mercury. By 



Mr. E. G. Wright 203 



Experiments on the Development of Electricity by Pressure ; 

 — Laxi:s of this Development. By M. Becouerel 204, 263 

 On the Nature of the Curves described by one of the Combina- 

 tions o/Jopling's Apparatus. By Mr. T. Tredgold 21 1 



Mr. J. Utting on a Planetary Analogy 214 



On the Construction of an Air Barometer. By Mr. Henry 



Meikle 214 



Complete Description of Erlan, a new Mineral. By Au- 

 gustus Breithaupt and C, G. Gmelin , . . 241 

 Derivative Analysis. By Mr.V. Nicholson 244, 348, 433 

 On the Destroyers of the Trees in St. James's Park . . 252 

 An easy Method of reducing Sidereal into Mean Time. By 



Dr. T. L. Tiarks 280 



Note on the Property which some Metals possess of facilitating 

 the Combination of Elastic Fluids. By MM. Dulong and 



Thenard 282 



0«lj^cF,HEREiNER's Experiment. By W. Herapatii, Esq. 286 



