IV CONTENTS. 



Page 

 Mr. G. Rose on the crystallized Compounds of Osmium and 



Iridium found in the Ural 101 



M. Nils Nordenskiold on Phenakite, a new Mineral from the 



Ural 102 



Mr. J. Hogg on the Influence of the Climate of Naples upon 

 the Periods of Veg'etation as compared with that of some 



other Places in Europe (concluded) 102 



Mr. VV. West on a remarkable Analogy between ponderable 



Bodies, and Caloric and Electricity 110 



Rev. P. Keith on the Internal Structure of Plants 112 



Mr. W. Hopkins's Remarks on Farey's Account of the Strati- 

 fication of the Limestone District of Derbyshire 121 



Dr. Prout's Reply to Dr. W. C. Henry. . . „ 132 



Prof. J. D. Forbes's Account of some Experiments on the 

 Electricity of Tourmaline, and other Minerals, when ex- 

 posed to Heat 1 33 



Proceedings of the Zoological Society 143 



M Dcebereiner on some new Combinations of Platina 150 



M. C. Matteucci on the Rotary Motion of Camphor 152 



On Margaron, Stearon, and Oleon 153 



M. Boussingault's supposed Compound of Hydrogen and Pla- 

 tina 1 55 



M. Wohler on Borates of Magnesia 156 



M. Payen on the Action of Tannin and some other Substances 



on the Roots of Plants 157 



Discovery of Platina in France — Prof. Haussmann on Mr. 



Whewell's Account of his Minerological Works 158 



Mr. J. H. Pratt's Improvement in Professor Henslow's Clino- 

 meter — Primary Geology 159 



Meteorological Observations 160 



NUMBER XXVII.— SEPTEMBER. 



Mr. Faraday's Experimental Researches in Electricity. — Se- 

 venth Series 161 



Rev. P. Keith on the Internal Structure of Plants (continued) 181 



Mr. W. G. Horner's Considerations relative to an interesting 

 Case in Equations, connected with the Investigation of the 

 " Principle of Least Pressure " 188 



Mrs. Griffiths's Observations on the Spectra of the Eye and the 

 Seat of Vision 192 



Mr. J. Bryce's Addendum to a Descriptive Catalogue of the 

 Minerals of the North of Ireland 196 



Prof. Young on the Development of certain Trigonometrical 

 Functions 198 



W. H. M.'s Description of an Improvement in the Construc- 

 tion of Say's Instrument for measuring Specific Gravities . . 203 



Rev. P. Keith on Phytological Errors and Admonitions 205 



