CONTENTS. 
PART I. (1853-4.) 
I. On the Impregnation of the Ova of the Salmonide. By Joun Davy, 
M.D., F.R.S. Lond. & Edin., Inspector-General of Army Hospitals, 
Il. On the Torbanehill Mineral. By Tuomas Stewart TratLt, M.D., 
F.R.S.E., Professor of Medical Jurisprudence in the University of 
Edinburgh, : ; : 5 , ’ 
Ill. 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, 
IV. On the Action of the Halogen Compounds of Ethyl and Amyl on some 
Vegetable Alkaloids. By Mr Henry How, Assistant to Professor 
Anverson, Glasgow University, 4 
V. On a General Method of Substituting Iodine for Hydrogen in Organte 
Compounds, and on the Properties of Todopyromeconic Acid. By Mr 
James F. Brown, Assistant to Dr ANDERSON, Glasgow, F 
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, ; : : : : : x 
VII. On the Mechanical Energies of the Solar System. By Professor WILLIAM 
THOMSON, . f ‘ ‘ ; : : 
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, 
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