INDEX. 
509 
H. 
Harris (William Snow, Esq.). On the transient magnetic state of which various sub- 
stances are susceptible, 67. 
On the influence of screens in arresting the progress of 
magnetic action, 497. 
On the power of masses of iron to controul the attractive 
force of a magnet, 501. 
Herschel and Babbage, their explanation of certain magnetic phenomena, disputed by 
Arago, 86. 
I. 
Imperial Standard Yard for the Royal Society , construction and verification of, 345. 
Iron ( masses of), on their power to controul the attractive force of a magnet, 501. 
Ivor v (James, Esq.). On the equilibrium of fluids, and the figure of a homogeneous planet 
in a fluid state, 109. 
On the theory of elliptic transcendents, 349. 
J. 
Jupiter, of what its great inequality consists, 289. 
K. 
Kater (Captain Henry). An account of the construction and verification of a copy of the 
imperial standard yard made for the Royal Society, 345. 
Kraft, his formula for connecting dip observations with each other, 100. 
L. 
Lloyd (John Augustus, Esq.). An account of operations carried on for ascertaining the 
difference of level between the river Thames at London Bridge and the sea, 167. 
Lubbock (John William, Esq.). Researches in physical astronomy, 17, 231 and 283. 
On the meteorological observations made at the apart- 
ments of the Royal Society during the years 1827, 1828 and 1829, 223. 
• ■■ — On the tides in the port of London, 379. 
M. 
Magnetism , various substances susceptible of a transient state of, 67. 
( terrestrial ), on the probable electric origin of all the phenomena of, 99. 
— — its laws inconsistent with those of a permanent magnetic body, 
but perfectly coincident with those of a body in a transient state of magnetic induction, 
102 . 
