CONTENTS. 



PART I. (1853-4.) 



PAGE 



I. On the Impregnation of the Ova of the Salmonidce. By John Davy, 



M.D.. F.R.S. Lond. & Edin., Inspector-General of Army Hospitals, 1 



II. On the Torbanehill Mineral. By Thomas Stewart Traill, M.D., 

 F.R.S.E., Professor of Medical Jurisprudence in the University of 

 Edinburgh, . . . . . . . - 7 



III. On a New Hygrometer or Dew-Point Instrument. By A. Connell, Esq., 



F.R.S.E., Professor of Chemistry in the University of St Andrews, 15 



IV. On the Action of the Halogen Compounds of Ethyl and Amy I on some 



Vegetable Alkaloids. By Mr Henry How, Assistant to Professor 

 Anderson, Glasgow University, . . . . .27 



V. On a General Method of Substituting Iodine for Hydrogen in Organic 

 Compounds, and on the Properties of Iodopyromeconic Acid. By Mr 

 James P. Brown, Assistant to Dr Anderson, Glasgow, . . 49 



VI. Note on the Possible Density of the Luminiferous Medium, and on the 

 Mechanical Value of a Cubic Mile of Sunlight. By Professor Wil- 

 liam Thomson, . . . . . . .57 



VII. On the Mechanical Energies of the Solar System. By Professor William 



Thomson, ........ 63 



VIII. On the Meteorology of the English Lake District, including the Results 

 of Experiments on the Fall of Rain, the Temperature, the Dew-Point, 

 and the Humidity of the Atmosphere, at various Heights on the Moun- 

 tains, up to 3166 feet above the Sea Level, for the Years 1851, 1852, 

 vol. xxi. b 



