INDEX. 
page, 
Pleura , observations on air found in the pleura, in a case 
of pneumato-tliorax ; with experiments on the absorp- 
tion of different kinds of air introduced into the pleura, 496 
Pneumato -thorax, observations on air found in the pleura, 
in a case of pneumato-tliorax, - 496 
Pond, John, Esq. on the changes which have taken place 
in the declination of some of the principal fixed stars, 34 
• —Appendix to his Paper, on the changes 
which appear to have taken place in the declination of 
some of the fixed stars, - - - -39 
— — on the parallax of a Lyrse, 33 
— — on certain changes which appear to 
have taken place in the positions of some of the principal 
fixed stars, - - 529 
Presents , a list of those made to the Royal Society from 7th 
November, 1822, to 19th June, 1823, - - - 541 
R 
Refractions, astronomical, a dissertation on the, - - 409 
Rio de Janeiro , series of experiments made at this place 
with an invariable pendulum, - 220 
S 
Sabine, Captain Edward, on the temperature at con- 
siderable depths of the Caribbean Sea, - 206 
San Bias de California , details of experiments made there 
with an invariable pendulum, - 219 
Sea, Caribbean , on the temperature of it at considerable 
depths, - - - - - 206 
Shells, fossil, - - - - - 393 
Sound, experiments for ascertaining its velocity, at Madras, 
in the East Indies, - - - 
Stars, f red, on the changes which have taken place in the 
declination of some of the principal of them, - 34 
— on certain changes which appear to have taken 
place in the position of some of the principal of them, - 529 
Survey of Great Britain, Trigonometrical, observations on 
the heights of places in that survey, - 73 
T 
Titanium, metallic, - » » - 17 
— — — — —on its apparent magnetism, - - 400 
