INDEX. 
L page 
Leouat, Mr. His account of the habits of the dugong, 150 
Life contingencies, a sketch of an analysis and notation 
applicable to the estimation of their value, - 214 
Light . homogeneous, on the action of crystallized bodies 
on it, - - - - 45 
Lizard tribe, the structure of their vertebras, - 160 
Longitude , on the errors in longitude as determined by 
chronometers at sea, arising from the action of the iron 
in the ships upon the chronometers, - - 196 
Lungs, on the elasticity of them, - 29 
experiments to ascertain the extent of the power 
to distend them to the dimensions which they occupy 
in the sound system, - - 35 
Lyme, fossil organic remains discovered in the cliffs at 
that place, - - - - - 159 
M 
Malabar, 74 guns, extract from the survey made by the 
officers of Plymouth Yard on that ship, - - 142 
Mesenteric glands, examination of their contents, in the 
case of a man who died in a fit an hour after having 
eaten his dinner, - - - - 7 
Micrometers , on the method of cutting rock crystal for 
them, _____ 126 
Moel Elio, its measurement by the thermometrical ba- 
rometer, - - 302 
N 
Narwhal, a section of the milk tusk of this animal com- 
pared with a similar section of that of the dugong, 147 
Nitre, crystal oj, mode of examining its rings, by pro- 
jecting them on a large sheet of paper, stretched, while 
moist, on a drawing board, - 80 
P 
Perkins, Jacob, Esq. on the compressibility of water, 324 
Planets , new, their oppositions, - - - 331 
Platinum, on some combinations of it, - - 108 
on a peculiar compound of it obtained from sul- 
phate of platinum by the agency of alcohol, - 108 
MDCCCXX. Z Z 
