INDEX. 
page 
Kater, Captain Henry. Notice respecting a volcanic 
. appearance in the moon, - - - - 1 30 
— An account of the re-measure- 
ment of the cube, cylinder, and sphere, used by the late 
Sir George Shuckburgh Evelyn, in his enquiries re- 
specting a standard of weights and measures, - 316 
Kidd, John, M. D. Observations on naphthaline, a pecu- 
liar substance resembling a concrete essential oil, which 
is apparently produced during the decomposition of 
coal tar, by exposure to a red heat, - - 209 
L 
Lenses , Compound , on their aberrations, - - 222 
on the destruction of the spherical aber- 
ration of two of them of the same medium, placed close 
together, with a view to the improvement of magnifiers, 
eye-glasses, and burning lenses, - - - 212 
Light , Rays of, on the destruction of the chromatic aber- 
ration of the imperfections arising from their different 
refrangibility, - 249 
Lunar Nutation, - 345 
M 
Manatee, of the West Indies, on the peculiarities that dis- 
tinguish this animal from the dugong of the East 
Indian Seas, - - - 390 
Measure , linear, an account of the comparison of various 
British standards of linear measure, - - 75 
Melville Lsland, experiments to determine the times of 
vibration of the pendulum there, - 177 
Metals, experiments on the different conducting powers of 
different metallic substances, - - 430 
Micrometer , an account of one made of rock crystal, - 101 
Moon , notice respecting a volcanic appearance in it, - 130 
Morton, Earl of, a communication of a singular fact in 
natural history, - - - - 20 
N 
Naphthaline, a peculiar substance resembling a concrete 
essential oil, which is apparently produced during the 
decomposition of coal tar, by exposure to a red heat, 
observations on it, - - - 209 
Needle, Compass, on the best kind of steel and form for one, 104 
