INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1847. 
A. 
Alcohol, on the value in absolute, of spirits of different specific gravities, 249. 
Atmospheric Tide, on the Lunar, at St. Helena, 45. 
Automatic Registration of Magnetometers and other Meteorological Instruments, by Photography, 
59, 69. 
B. 
Baily (Mr.). On the cause of the discrepancies observed by, with the Cavendish Apparatus for 
determining the mean Density of the Earth, 217. 
Bakerian Lecture, 1. 
Barometrograph (Photo-), 113. 
Brooke (Charles, Esq.). On the Automatic Registration of Magnetometers, and other Meteo- 
rological Instruments, by Photography, 59. 
Supplement, 69. 
C. 
Claudet (A., Esq.). On different properties of Solar Radiation producing or preventing a 
deposit of Mercury on Silver Plates coated with Iodine, or its compounds with Bromine or 
Chlorine, modified by Coloured Glass media and the Vapours of the Atmosphere, 253. 
D. 
De la Rive (M. Auguste). Researches on the Voltaic Arc, and on the influence which Mag- 
netism exerts both on this Arc and on bodies transmitting interrupted Electric Currents, 31. 
Density of the Earth, on the cause of the discrepancies observed by Mr. Baily with the Caven- 
dish Apparatus for determining the mean, 217. 
