INDEX. 



779 



Nina, The, 773. 

 Nitrogen, 359. 



,, Compounds of, 359. 



,, Menoxide, 361. 

 Nitrogenous substances, 422. 

 Nodal points, The, 194. 

 Nodes of sound waves, 169. 

 Noise distinguished from sound, 167. 

 Nomenclature, Astronomical, 471. 

 Normandy, A trip in, 6. 



Object, A natural, 3. 



Oils, Fats and, 421. 



"Old Red" a freshwater deposit, 577. 



Oolite formation, The, 586. 



Opium, 416. 



Optical cabinets, 98. 



Optics, The science of, 93. 



Organic chemistry, 410. 



Orion constellation, 544. 



Orthoptera, The, 721. 



Oxidation, 349. 



Oxygen, Discovery of, 348. 



,, consumed by breathing, 342. 



,, How to obtain, 348. 

 Oysters, Light from shells of, 160. 

 Ozone, Use of, 344. 



Paint, Luminous, 160. 

 Palace, Insects', 10. 

 Palaeozoic systems, 573. 

 Pallas, Discovery of, 528. 

 Paper wheel toy, 764. 

 Parachutes, Descents by, 304. 

 Parallax, Explanation of, 484. 

 ,, Illustrations of, 483. 

 ,, Use of, 485. 



Para-magnetic and dia-magnetic, 258. 

 Paraselenas, Cause of, 648. 

 Paris, Great snowfall in, 20. 

 Pedometer, The, 756. 

 Peiffer's electrophorus, 279. 

 Pen, electric, The, 248. 

 Pencil, Edison's Pneumatic, 454. 

 Pendulum, Description of the, 42. 



The, 481. 



,, Variations in the, 42. 

 Period, The Glacial, 595. 

 Permian formation, The, 582. 



,, ,, Fauna of, 582. 



Phantom band, A, 196. 

 Pharaoh's serpents, 315. 

 Phases of the Moon, 515. 

 Phenakistocope, The, no, 121. 

 Phenomena, Atmospheric, 642. 



Chemical, 22. 



Meteorological, 20. 



Nature, 3. 



of contrast, 112, 113. 



Physical, 22. 

 Phial of the four elements, 47. 

 Philosophy, Natural, 4. 

 Phonography, Edison's, 190. 

 Phosphorescence, 331. 

 Phosphorus, Bologna, 333. 



,, how obtained, 381. 

 Photography, Camera for, 151. 



,, Instantaneous, 153. 



Photometers, xoi. 

 Photometry, 101. 

 Photophone, The, 155. 

 Photosphere, The, 499. 

 Phraseology, Chemical, 338. 

 Physics, Meaning of, 22. 

 Mechanical, 31. 

 Pile, A microscopic, 200. 

 ,. hermetic, The, 283. 

 ,, Volta's first, 219. 



Pile, Zamboni, 221. 



Pins, scarf, Electrical, 281. 



Pisces, Constellation, 540. 



Pistil, The, 678. 



Pistils, Use of, 665. 



Pitch, Musical, 193. 



Plains, 626. 



Planet, The giant, 528. 



Planets, Comparative sizes of, 407. 



List of the, 487. 



Minor, 489, 527. 



,, Moons of the, 489. 

 Plant, Definition of a, 661. 

 Plants, Classification of, 694. 



,, Flowering, 664. 



Growth of, 665. 



,, Monoecious, 68 r. 



,, Non-flowering, 686. 



,, Similarity of, to animals, 658. 



,, Structure of, 66 1. 

 Plateaus, Tablelands or, 626. 

 Plating, Electro, 227. 

 Platinum, All about, 327. 



,, Uses of, 408, 447. 

 Plumbago, Graphite or, 370. 

 Plutonic rocks, The, 601. 

 Pneumatic despatch, The, 57. 

 Polaris, The star, 542. 

 Polarization of light, 155. 

 Polarizer, Use of a, 156. 

 Poles, Electrodes or, 221. 

 Pompeii, Paintings at, 121. 

 Porcelain, Manufacture of, 441. 

 Porosity, Definition of, 5. 

 Positive and negative electricity, 202. 

 Portuguese man-of-war, The, 709. 

 Potassium, 390, 437. 



,, Compounds of, 391. 

 Praxinoscope, The, no, 123. 



,, theatre, The, 126. 



Prehistoric man, 597. 

 Preservation of insects, 8. 

 Press, Hydraulic, 61. 

 Pressure, Fluid application of, 63. 



,, on the ocean bed, 616. 

 Prism, Nichols', 156. 

 Probabilities, Science of, 726. 

 Protoplasm, Definition of, 659. 

 Protozoa, Definition of, 704. 

 Protractor, Use of the, 475. 

 Pump, The common, 57. 

 Punctum caecum, The, 134. 

 Puzzle, The " Boss," 731. 

 Pyrites, Crystallized, 18. 



Iron, 444. 

 Pyrometer, The, 91. 



Quadrant, Use of the simple, 476. 

 Quarry, Derivation of the term, 427. 

 Quartz, Varieties of, 436. 

 Quicksilver. See Mercury. 

 Quinine, 416. 



Radiant heat, 90. 

 Rain, Causes of, 637. 



,, Distribution of, 637. 



,, Measurement of, 638. 



,, water, The, 71. 

 River-beds, Slope of, 626. 

 Rainbow, The, 647. 

 Rays, Medullar, 669. 

 Reaction, Action and, 35. 

 Recreation, Science and, x. 

 Red fire, 395. 

 Reflection of heat, 92. 

 light, 95. 

 sound, 171. 

 Refraction of heat, 92. 



Reaction of, light, 96. 



,, sound, 171. 



Refractions, Table of, 479. 

 Reptiles, The age of, 585. 

 Repulsion in air-particles, 48. 

 Ruins, 421. 



Rest, No absolute, 40. 

 Rhizome, Definition of, 667. 

 Rhone, Colours of the, 570. 

 Robert's clock, 753. 

 Robin's spectres, 138. 

 Rocks, Acidic, 602. 



,, Basic, 602. 



Igneous, 571, 601. 



Plutonic, 601. 



,, Sedimentary, 570. 



,. Volcanic, 601. 

 Roots, Various, 666. 

 Rubidium, 393. 



Sagittarius, Constellation, 539. 

 Sailing on railroads, 465. 

 Salt, Glauber's, 393. 

 ,, Epsom, 395. 



,, what meant by in chemistry, 311 

 Sandstone, Old Red, 576. 



,, Upper Red, 585. 

 Sassoline, Boron or, 435. 

 Satellites, Planetary, 489. 

 Saturn, Rings of, 532. 

 Satellites of, 532. 

 ,, The planet, 532. 



Tree of, 333. 



Sawing, Machine for, 767. 

 Scale, diagonal, Use of the, 477. 

 Scarf-pins, Electrical, 281. 

 Scavengers, Nature's, 713 

 Scenograph, Description, 153. 

 Scheele, Apparatus used by, 28. 

 Science and Recreation, i. 

 ,, Definitions of, 15. 

 ,, Domestic economy and, 757. 

 ,, in the open air, 6. 

 Scorpio, Constellation, 539. 

 Sea, At the bottom of the, 615. 

 Salt ness of the, 610. 

 The, 6 10. 

 anemones, 710. 

 bed, Irregularity of the, 617. 

 cucumbers, 714. 

 urchins, 712. 

 water, Buoyancy of, 67. 



,, Composition of, 610. 

 Sealing-wax, Experiments with, 197. 

 Seasons, Recurrence of the, 507. 

 Sedimentary rocks, 570. 

 Selenium, 386. 



Mineral nature of, 435. 

 Selenography, 510 et sq. 

 Semaphore, The, 232. 

 Serpents, Pharaoh's, 315. 

 Sewing-machines, Motive power, 758 

 Shadows, comic, 158. 

 Shot, how made, 403. 

 Signalling, 183. 

 Silicon, Silica and, 383, 436. 

 Silurian system, 575. 

 Silver dissolved by nitric acid, 326. 

 ,, how obtained, 406, 447. 



Uses of, 406. 

 Simoon, The, 631. 

 Sky, How to read the, 555. 

 ,, why blue, 647. 

 Sleet, Cause of, 640. 

 Sleight of hand, Chemistry and, 335. 

 Smelting, Melting and, 396. 

 Snow, Causes of, 639. 

 Great falls of, 20. 



