( 421 ) 
INDEX. 
A 
Achromatic reflecting telescopes, with silvered lenses, described, 391- 
Acid, pyro-citric, 400. — hydro-carbo-sulphuric, 401. 
Acoustics, notices in, 184. 
Adriatic Sea, journal of a tour to the coast of the, 132, 311. 
Ailantlius glandulosa recommended for gardens, 194. 
Air, great dryness of, at Perth, 186. 
Airy, Mr G. B., on the change in the focal length of an object-glass, 
from a change in the velocity of light, 388. — on achromatic tele- 
scopes with silvered lenses, 391. 
Alcohol, on a combination of, with oil of turpentine, 401. 
Alps, ice-caverns in the, 1, 290. 
America, North, on the increase of its population, 41, 328. 
Ammonia found in lava, 188. 
Ampere, M., his electro-magnetic apparatus described, 373. — his theory 
of electric currents examined, 381. 
Anderson, Mr, his new atmometer, 185. 
Anderson, Dr, his new dropping apparatus, 418. 
Animation, suspended, cases of recovery from, 284. 
Ants, on the white and black ones of India, 1 96. 
Arabian Sea, on the colour of the, 415. 
Astronomy, scientific intelligence in, 1 82, 392. 
Atmometer, notice of a new one, 185. 
Atmosphere, on the height of the, 416. 
Aurora borealis, on the order of its appearance, and progress, 303. 
B 
Babbage, Mr, on the theoretical principles of the machinery for calcu- 
lating tables, 122. 
Barlow , Mr Peter, on the laws of electro-magnetism, 368. — account of 
a series of electro-magnetic experiments by, Id. 
Barton, Mr, his method of ornamenting steel, ike. with the prismatic 
colours, 128. 
Barytes, test for, 188. 
Baumans dynameter for measuring magnifying powers, 1 82. 
Bellam, M. Angelo, on variations in the bulbs of thermometers, 397- 
Bessel s survey of the heavens, 39 2. 
Beudant M., on the calcareous tufas of Hungary, 29. 
Binomial theorem, on the principles used in its demonstration, 391 = 
Blamville, Mr, on human skulls found in Germany, 408, 
Blow-pipe, hydrostatic, on a safety apparatus for it, 388. 
