CHAMBERS'S INFORMATION FOR THE PEOPLE. 



Nitrogen, or azote, chemically considered, 320 ; its 

 function in nutrition, 737. 



Nitroglycerine, or glenoine oil, 352. 



Nitrous oxide gas (laughing gas), 321. 



Noctule, or Great Bat ( Vesper tilionidce), in Zoology, 

 189- 



Nodes, in Astronomy, the points at which the 

 ecliptic cuts the equator, 12. 



Nolanaceae, order in Botany, 102. 



Nomenclature, in Botany, 82; in Zoology, 131. 



Nones, in the Roman calendar, 290. 



Norman style, in Architecture, 474. 



Nozzle, or clay condenser, 412. 



Nucleus, nucleoli, in Zoology, 132. 



Nummulites, a fossil genus of small chambered 

 shells, so called from their resemblance to a 

 Roman coin (nummus), 31. 



Nursing, in sickness, 783. 



Nutation, in Astronomy, 14. 



Nutrition, function of, 113, 130; theory and prin- 

 ciples of, in Dietary, 737. 



Nux vomica, a poison, 783. 



Nyl-ghau, figured, in Zoology, 183. 



Nymphaeaceae, order in Botany, 90. 



Oak, varieties and culture of, 598. 



Oats, in Agriculture, 529 ; in Dietary, 740. 



Obelisks, in Architecture, 465. 



Observatory clock, on Calton Hill, Edinburgh, 300. 



Obsidian, in Mineralogy, 396. 



Ocean, general constitution of, 52 ; depth, tempera- 

 ture, saltness, colour, phosphorescence, and other 

 physical properties of, 59, 60. 



Ocean currents, 43, 6 1. 



Ochre, its nature and uses as a pigment, 393. 



(Esophagus (Gr. oiein, to carry, phagein, to eat), 

 the gullet, in Human Physiology, 1 14. 



Oils, fixed or non-volatile, in Applied Chemistry, 

 348. 



Oils, mineral, paraffin, petroleum, kerosene, naph- 

 tha, shale, in Lighting, 492. 



Oils, volatile, in Chemistry, 336. 



Old Red Sandstone system, described, 26. 



Oleaceae, order in Botany, 102. 



Olefiant gas, 324, 334 ; in Lighting, 493. 



Oleine, oleic acid, liquid principles in fat, 335 ; in 

 Applied Chemistry, 348. 



Olfactory (smell-giving), the epithet in Anatomy, 

 designating the nerves of the nose, 125. 



Olives, oliveworts (Oleacece), order in Botany, 102. 



Olympiads, origin of, in Greek chronology, 293. 



Omnivora, in Zoology, 181. 



Onion, in Kitchen-garden, 554. 



Onyx, a precious stone, 400. 



Oolite or Jurassic system, 29. 



Opal, 400. 



Ophidia, order in Zoology, 163. 



Ophioglossaceas, sub-order of ferns, in. 



Opium, 91, 783. 



Opossum, one of the order Marsupialia, in Zoology, 

 178. 



Optic thalami, in Human Physiology, 124. 



OPTICS, the science of light, 241. 



Orang (Simla satyrus), 191. 



Orange (citrus}. See Citron-worts, in Botany, 92. 



Orchards, ground devoted to the rearing of fruit- 

 trees, 582 ; orchard-house, construction of, 591. 



Orchidaceas, order in Botany, 108. 



Organ of Corti^ part of ear, 128. 



Ormolu (Fr.), an alloy of zinc and copper ; bronze 

 or copper gilt usually goes under this name, 405. 



816 



Ornithology (Gr. ornis, a bird), that branch of 



natural history having reference to birds. See 



166-176. 

 Ornithorhynchus (ornis, a bird, and rygchos, a 



beak), in Zoology, 177. 

 Orpiment, yellow sulphuret of arsenic, largely 



employed in dyeing and calico-printing, 415; 



preparation of, 340. 

 Orreries, or planetariums, 295. 

 Orthoptera (straight-winged), in Entomology, 146. 

 Oscillating engine, 428. 



Oscillation, motion like that of a pendulum, 202. 

 Osmium, a metallic element, 416. 

 Osmundaceas, sub-order of ferns, in. 

 Ostrich family, order Cursores or Runners, in 



Zoology, 170. 

 Oswego, 741. 

 Otter, an aquatic species of the Mustelidae family, 



in Zoology, 186. 

 Outcrop, in Geology, 19. 

 Ovalo, in Architecture, 469. 

 Ovidae, sheep, in Zoology, 183. 

 Owl, family Strygidse, order Raptores, in Zoology, 



175- 



Ox, in Zoology, 183 ; in Husbandry, 625-637 ; as 

 a beast of draught, 435. 



Oxalic acid, in Chemistry, 311, 323; in Medi- 

 cine, 783. 



Oxidation, process of, 313. 



Oxides, in Chemistry, 311. 



Oxygen, chemically considered, 319. 



Oyster, in Zoology, 152 ; Fishery, 713 ; Dietetics, 

 748. 



Ozone, chemical nature of, 320. 



Pachydermata (Gr. pachys, thick, derma, skin), 180. 

 Paddy, an Indian term for rice in the husk, 740. 

 Paints, in Applied Chemistry, 344. 

 Palaeotherium (Gr. palaios, ancient, and therion, 



wild beast), 31. 



Palate, in Human Physiology, 114. 

 Palladium, in Chemistry, 327 ; in Metallurgy, 416. 

 Palmitine, a glyceride, 335. 

 Palms (Palmacece), natural order of, 109. 

 Palpitation of the heart, treatment of, 772. 

 Pampas of La Plata, 54, 59. 

 Pancreas, the functions of, 116. 

 Pannier, in Dress, 799. 

 Pansy or violet, nature and culture of, 567. 

 Pantaloons, origin and introduction of, 797. 

 Papaveraceae, the poppy tribe or poppyworts, 90. 

 Paper, hand and machine made, 382-383. 

 Papier-miche", in Fictile Manufactures, 368. 

 Papilionaceous flowers (Lat. papilio, a butterfly), 



95- 



Paradisidae (birds of Paradise), in Zoology, 173. 



Parallax, an astronomical term, defined, 4. 



Paralysis, 778. 



Paraplegia, 778. 



Parasitic plants, 67. 



Parasitical, a term in Natural History, 67. 



Parchment, preparation of, in Applied Chemistry, 



348. 



Parenchyma (cellular tissue), 68. 

 Parian or statuary, in Porcelain, 359. 

 Parr, in Angling, 704 ; in Fisheries, 713. 

 Parrots, in Zoology, 173 ; as cage-birds, 671. 

 Parsley, nature and culture of, 558. 

 Parsnip, in Garden Culture, 553 ; in Dietary, 742. 

 Parthenon, the, 470. 

 Partridge, in Zoology, 172 ; in Field-sports, 697. 



