CONTENTS OF VOL. XVII. 



NUMBER CVIL JULY, 1840. Page 



Prof. Johnston on the Iodide of a new Carbo-hydrogen 1 



Prof. Forbes on the Optical Characters of Greenockite (Sul- 



phuret of Cadmium) 8 



Mr. T. Taylor on a new Species of Biliary Calculus 8 



Dr. Foville on the Anatomy of the Brain 14 



Dr. J. Reade's Remarks on the permanent Soap Film and on 



Thin Plates 32 



Prof. Miller on the Form and Optical Constants of Nitre .... 38 

 Mr. R. Rigg's Observations on Mr. Smith's Experiments on 



Fermentation 39 



Mr. C. Holthouse on Increasing the Light of a common Argand 



Lamp 40 



Dr. R. Hare's Letter to Prof. Faraday, on certain Theoretical 



Opinions 44 



Prof. Faraday's Answer to Dr. Hare's Letter on certain Theo- 

 retical Opinions 54 



New Books : Dr. Meyen's Report on the Progress of Vegeta- 

 ble Physiology during the year 1837 65 



Proceedings of the Geological Society 66 



at the Friday-evening Meetings of the Royal In- 

 stitution 74 



Letter to Prof. Liebig on the Theory of Substitutions 75 



On the Formation of Lampic Acid 76 



Analysis of the Ashes of the Salsola Tragus 77 



Uncombined Hyposulphurous Acid 77 



On the Presence of Iodine in Cod Oil, by R. F. Marchand . . 78 

 Mr. M'Cord's Observations on the Solar and Terrestrial Ra- 

 diation made at Montreal 78 



Meteorological Observations for May, 1840 79 



Meteorological Observations made at the Apartments of the 

 Royal Society by the Assistant Secretary, Mr. Roberton ; 

 by Mr. Thompson at the Garden of the Horticultural Society 

 at Chiswick, near London ; by Mr. Veall at Boston ; and by 

 Mr. Dunbar at Applegarth Manse, Dumfries-shire : Table . . 80 



NUMBER CVIII. AUGUST. 



Rev. B. Powell on the Theory of the Dark Bands formed in the 

 Spectrum from partial Interception by transparent Plates . . 81 



a 2 



