INDEX. 
page 
Nerves , respiratory, anatomy of those of the trunk, - 290 
their origin, - - 286 
— ■ are organs of expression, - 307 
Nitric salt, not found in sea-water, - - 452 
O 
Object-glass, triple, on the concentric adjustment of it, - 32 
Observatory, Madras, its longitude by the eclipses of the 
satellites of Jupiter, from 1787 to 1801, - - 412 
Oreston, near Plymouth , account of the discovery of some 
fossil teeth and bones there, - 213 
P 
Pendulum, observations for ascertaining its length at 
Madras, in the East Indies, latitude 13°4' 9VN. with 
the conclusions drawn from the same, - - 127 
Percussion, experiments and observations on the develope- 
ment of magneticai properties in steel and iron by per- 
cussion, - - - - 241 
Phtlip, A. P. Wilson, M. D. Some positions respecting 
the influence of the voltaic battery in obviating the 
effects of the divisiou of the eighth pair of nerves, - 22 
Pitch-stone, Arran, experiments on it, - - 329 
Meissen, experiments to ascertain whether 
manganese really exists in it, - - 337 
Newry, experiments and observations on it 
and its products, and on the formation of pumice, - 313 
Placenta, some observations on it, - - 401 
specimen of a new mode of classing amimals, 
according to the structure of the placenta, - - 404 
Planaria, observations on that genus, - - 437 
Point de Galle and Friars Hood, their latitude and longitude, 43 1 
Pond, John, Esq. Astronomer Royal, his letter to Sir 
H umphry Davy, Bart. P. R. S. relative to a derange- 
ment in the mural circle at the Royal Observatory, - 86 
Potash, the state in which it exists in sea-water, - 455 
Presents, a list of those received by the Royal Society from 
November 1821 to July 1822, - 483 
Prout, William, M. D. Some experiments on the changes 
which take place in the fixed principles of the egg 
during incubation, - 377 
Pumice, on the formation of it, - 313 
artificial formation of it, - - - 333 
mdcccxxii. 3 S 
