INDEX 
TO THE 
PHILOSOPHICAL TRANSACTIONS 
FOR THE YEAR 1831. 
A. 
Abel and Jacobi (MM.), their new methods of investigation of elliptic functions, 350. 
Astronomy {physical ), researches in, 15, 231, and 283. 
Attraction {local), on the errors occasioned by it, in the courses of vessels, 215. 
Aurora Borealis , on its influence on terrestrial magnetism, 199. 
B. 
Barlow (Peter, Esq.). On the performance of fluid refracting telescopes, and on the 
applicability of this principle of construction to very large instruments, 9. 
■ ■ On the probable electric origin of all the phenomena of terrestrial 
magnetism ; with an illustrative experiment, 99. 
On the errors in the course of vessels, occasioned by local 
attraction ; with some remarks on the recent loss of His Majesty’s ship Thetis, 215. 
Barry (Alexander, Esq.). On the chemical action of atmospheric electricity, 165. 
Biot, the earth considered as a magnet by, 99. 
Blood {circulation of), sources and nature of the powers on which it depends, 489. 
C. 
Canals {narrow), supposed to traverse a mass of fluid in equilibrium, 116. 
Chladni, his discovery of the forms assumed by sand, &c. on vibrating plates, alluded 
to, 299. 
Clairaut, his theory cannot lead to the exact determination of the equilibrium of 
fluids, 121. 
inconvenience of his method of solving the lunar theory, 231. 
Comet {the second of\S22), observations on, 1. 
— ■ first discovered by M. Pons, 2. 
Lieutenant Henderson’s remarks on, 5. 
