INDEX. 
page 
Metre a bouts , comparison of the Mktre so called, 107 
Metre a traits , comparison of the Metre so called, 1G5 
Metre , French , on the length of it estimated in parts of 
the English standard, - 103 
Milky way, at the profundity beyond which the gaging 
powers of our instruments cannot reach, is not an am- 
biguous object, - - - 46*2 
Mountains, observations on the heights of some in the 
north of England, - 395 
— height of. Dr. Maskelyne’s rules for determin- 
ing it cited, - - 402 
— Dr. Hutton’s rules for determining 
it cited, - - 403 
Mulberry, black, on the colouring matter of this fruit, 114 
P 
Paper , sugar-loaf, some remarks on its colour and proper- 
ties, - - - 113 
Parallax, on that of certain fixed stars, - 275 
on that of the fixed stars in right ascension, 481 
on that of a. Aquilee, - - 4 77 
Pendulum vibrating seconds in the latitude of London, an 
account of experiments for determining the length of it, 33 
of the method of deducing the 
length of it, - - - 62 
— — length of it, - 87 
description of one employed in 
the foregoing experiments, 37 
— measurement of it, - 55 
— — — expansion of it, - 60 
— method of determining the 
number of vibrations made by it in 24 hours, 43 
Phosphorus, new experiments on some of the combinations 
of it, - - 316 
Polarisation and double ref raction, on their laws in regularly 
crystallized bodies, - 199 
Polarising forces, on the resolution and combination of 
them, and the reduction of all crystals to crystals with 
two or more axes, - - - 245 
Pond, John, Esq,. On the different methods of construct- 
ing a catalogue of fixed stars, - 405 
— — On the parallax of «, Aquilas, 477 
