INDEX. 
page 
Platinum , on a new fulminating compound of it, - 136 
Platinum, fulminating^ modes of obtaining it, - 1 3 8 
— its properties, - - 139 
— its composition, I46 
■ — — — theory of its formation and decompo - 
sition, - 155 
Pond, John, Esq,. On the parallax of the fixed stars, 1 5 8 
an appendix to his Paper on parallax, 173 
— — — on the parallax of the fixed stars. 353 
Porques ordinaires , leur remplacement par des porques ob- 
liques, - - 102 
Presents , a list of those made to the Royal Society from No- 
vember 1816, to July 1817, - - 363 
Profundity , or local situation of celestial objects in space, of 
a criterion for ascertaining it, - - 308 
R 
Rarefaction, its effect, by partly removing the pressure of the 
atmosphere, upon flame and explosion, - - 46 
on the effects of it by heat on combustion and 
explosion, 53 
Rhinoceros, an account of some fossil remains of that animal, 
discovered by Mr. Whitby, in a cavern inclosed in the 
limestone rock from which he is forming the Breakwater 
at Plymouth, - - . 176 
S 
Sepia, the distinguishing characters between the ova of that 
animal and those of the vermes testacea that live in water, 
explained, - - - - 297 
Snails , experiments made by the late Mr. John Hunter, to 
ascertain their mode of breeding, - - 299 
Starlight, of its equalisation, - - 309 
Stars, of their local situation in the heavens, - 303 
of a standard by which the relative arrangement of 
them may be examined, - - 304 
a comparison of the order of their magnitudes with the 
order of their distances, - - 306 
