INDEX, 
N page 
JYeuiro-earthy compounds , experiments on their decompo- 
sition into earths and acids by electricity, - - 13 
JVeutro-saline compounds , experiments on their decompo- 
sition into acid and alkali by electricity, - 18 , 1 9 
o 
Objects , experiments on the effects of their figure after the re- 
moval of a cataract, - - - - 88 
Oxalate of Ammonia , its application in analytical processes, 303 
P 
Pebbles , on those found intheRelistian mine cemented by tin ore, 293 
Pecari , observations on the stomach of the, - 154 
Pepys, William Hasledine, Esq. On a new eudiometer, 
accompanied with experiments elucidating its application, 247 
Ph/seter, remark on its oil, . - ~ 100 
Planet , new one discovered by Du. Olbers. Observations of, 260 
Plumbago, experiments on its combustion, - 335 
Presents received by the Royal Society from November 1806 
to June 1807 , . - - - 315 
R 
Rat, water, observations on the stomach of the, - • ] 49 
, common, , I50 
Rings, on the coloured concentric ones occasioned when one 
object glass is laid upon another, - - ISO 
, methods of producing them, - - 130 
■ , on measuring them, - - - ] g 7 
, considerations relating to the cause of their formation, 225 
, on their production without the assistance of any thick 
or thin plates either of glass or air, - - 230 
Robertson, Rev. Abram, on the precession of the equinoxes, 57 
Rumination, observations on this process, - - J72 
s 
Saline matter, existence of it in different fossile bodies, - 10 
Schroeter, John Jerome, Esq. His observations and mea- 
surements of the planet Vesta, 
245 
