INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1856. 
A. 
Acids, on the conjugate sulpho-, sulphometholic, &c., 453. 
Airy (G. B., Esq.). Account of Pendulum Experiments undertaken in the Harton Colliery, for 
the purpose of determining the Mean Density of the Earth, 297. — Introduction and history, 
297 ; description of experiments, 308 ; deduced proportion of gravity at the two stations, 
330 ; observations and calculations relating to the difference of attraction of the Earth’s 
shell on the two pendulums, upon an assumed value of density, 332; deduced mean density, 
342. 
Discussion of the Observed Deviations of the Compass in several Ships, 
Wood-built and Iron-built ; with a General Table for facilitating the examination of Compass- 
deviations, 53. 
■ Supplement to the “ Account of Pendulum Experiments undertaken in the 
Harton Colliery,” being an Account of Experiments undertaken to determine the correction 
for the Temperature of the Pendulum, 343. — Alteration in the value of the earth’s mean den- 
sity, 352 ; effect of the earth’s rotation and ellipticity, 353. 
Andrews (Dr. Thomas). On the Constitution and Properties of Ozone, 1. 
Arthur’s Seat, deflection of the plumb-line at. 591. 
Attraction, on the effect of local, 31 (see Pratt). 
B. 
Bakerian Lecture, On the Electro-dynamic Qualities of Metals, 649 (see Thomson). 
Barlow (Rev. John). On the Formation and some of the Properties of Cymidine, the Organic 
Base of the Cymole Series, 15. 
Barometer, construction of a standard, &c., 507. 
Beale (Dr. Lionel S.). On the ultimate arrangement of the Biliary Ducts, and on some other 
MDCCCLVI. 6 H 
