V 
Laterite, uses of . . 2(50 
Lavas . . . . .... 5 
Lead, carbonate of . . .... 1 
pipes, corrosion of .... 219 
■ , safety of, protected by 
tin ; .. .... 341 
Lens, polarizing structure of the .... 530 
Leuciscus, or dace family of fish .... 97 
Level, relative, of land and sea .... 487 
plan 
for fixing the . . .... 488 
Levelling, efiectual mode of .... 23(5 
]-iife- apparatus, travelling .... 99 
Light, the Newtonian and undulatory 
theories of . . .... 45 
, Powell on the dispersion of .. 173 
, filtration and cooling of ... . 237 
phosphoric, emitted by flowers 238 
and heat .. .... 274 
, new, of the age .... 401 
■ , polarized . . .... 493 
Light-house illumination, practical 
improvement in . . .... 238 
Light-houses, metallic .... 344 
Likenesses of distinguished indivi- 
duals . . . . .... 597 
Lime, eifects of, as applied to difierent 
soils . . . . .... 545 
Limestone, carboniferous .... 497 
Litharge, native . . .... 1 
Loadstone, the most powerful .... 384 
Locomotion, cheap .. .... 401-' 
■ , aerial . . .... 403-' 
Locomotive, carriages, theory of ... . 512- 
power, new .... (50 7’'' 
London, improvements in .... 401 
Longitude at sea . , .... 344 
Loti, American . . 390 
Lunar theory, empirical 490 
Lungs, carbonic acid gas from the. ... 7 
Lycium of Royle . . .... 96-' 
Machine for draining land .... 603 
: , for planting corn and cot- 
ton .. .. .... 608 
Madras, geological features of .... 256 
Magnesia, carbonate of, Daubeny on 
.... 217 
Magnet, effect of melted iron on ... . 216 
• , powerful natural .... 384 
Magnetical observations at Nerts- 
chinsk . . . . .... 93 
Magnetic influence produced by the 
electrical machine. . . .... 93 
forces applied to manufactur- 
ing purposes .. 105 
characters of the metals .. 386 
pole, position of the south 590 
Magnetism, terrestrial .... 6 — 221 
of tlie earth .... 93 
• , heat, and electricity .... 518 
, earth’'s, distribution of the 519 
Magnetizing needles, effect of light 
in . . . . 455 
j new method of .... 457 
::x. 
Magneto- electric induction .... 340 
Magneto-electrical machines, construc- 
tion of. . . . .... 469 
Maldives, survey of the .... 299 
Malt, Thomson on .... 98 — 142 — 244 
, _ .. 499 
Mammalia, preservation of .... 409 
, spinning, preparing, and 
mounting .. .. .... 410 
^ “ — of the Norfolk crag .... 496 
of the Mauritius .... 593 
Manganese, sesqui-sulphate of .... 87 
black oxide of, for manufac- 
turing purposes . . .... 336 
Manganic. and hypermanganic acids, 
and salts of these acids .... 588 
Mangel wurtzel, sugar from .... 499 
Manufacture of pens 24--'’ 
Mariners, important to .... 620 
Masupial animals, generation of ... . 43 
Matter, organic .... 6 
Mechanic, practical .... 611 
Mechanical arts .... 58 
Mechanic’s pocket guide .... 391 
Mechanism, ingenious piece of .... 400 
Medals, anew method of engraving 497 
Medical college .... 291 
Meeting, public, at the Town hall .. 678 
Melamine .... 164 
, nitrate of .... 165 
, oxalate of .... 165 
, acetate of .... 165 
^ phosphate of .... 165 
Merchantieis, de, auctore Thoma, &c. 390 
Meteoric stones .... 36 
Meteorology and tides .... 221 
Microscope, hydro-oxygen .... 462 
Military Orphan School .... 150 
Milk, mode of preserving, for long 
voyages ....24 — 394 
Mineralogical specimens from New 
South Vvales .... 598 
Mineralogy, geology, and mineral ana- 
lysis, by Dr. Thomson .... ] 73 
Mineral waters .... 36 
Mines, report on accidents in .... 181 
w^orked by the aid of the safety 
lamp 183 
Mining 301 ' 
Mitra, specimens of .... 592 
Mollusca of the Mauritius .... 594 
Moon inhabited .... 138- 
Mortality, law of, for British India 253-321 
Moth silk .... 187 
Motion, laws of, of floating bodies . . 105 
Mountains, principal, comparative 
view of .... 245 
Mulberry, indigenous, about Poona. , 563 
tree, DeVerinne, ou .... 564 
Museum buildings, British 463 
Mustard plant of the Scripture .... 389 
Nagpore, population of .... 300 
Naphthalase, chloro .... 387 
, hydro-chlorate of chloro 387 
