INDEX. 
Merthyr Tydvil , in Wales, a description of certain very- 
small cubes, occasionally found in the slag of the great 
iron works there, • 
Muriatic acid gas, Note on its condensation into the liquid 
form, - 
N 
Needle, compass, curious anomaly observed between its 
daily variations in-doors and in the open air, 
dipping, on its daily variation, 
horizontal, on its diurnal deviations when under 
the influence of magnets, - 
account of the observations made on 
its daily variation in various directions, 
* and dipping, observations and experi- 
ments on their daily variation, under a reduced direc- 
tive power, - 
Nerves of the orbit of the eye, of those performing the invo- 
luntary motions, - 
— — - of the voluntary nerves, 
of the fourth nerve, 
Nitrous oxide, on its reduction to the liquid state, 
O 
Ophthalmicus , a division of the fifth nerve, on its functions, 
Oreston, on some fossil bones discovered in caverns in the 
lime-stone quarries of that place, - 
a description of the fossil bones found in the 
caverns there, - 
P 
Parallax, on that of a Lyrte, - - 
on the difference of that between y Draconis 
and « Lyras, - 
on the absolute parallax of a Lyrac, 
Pendulum, invariable, an account of some experiments made 
with one at New South Wales, - 
details of experiments made with one 
at different places, - - - - 
Pepys, W. H. Esq. an account of an apparatus on a pecu- 
liar construction for performing electro-magnetic ex- 
periments, - 
4 B 
page 
18 
164 
339 
337 
342 
329 
326 
292 
298 
295 
195 
290 
78 
81 
53 
54 
55 
308 
211 
187 
mdcccxxiii. 
