INDEX. 



7 8i 



Vivaria, TO. 



Volcanic rocks, The, 601. 



Volcanoes, Earthquakes and, 620. 



,, Formation of new, 623. 



,, Number of, 621. 



Voltaic arc, The, 223. 

 Volume, Weight and, 59. 



Waste, none in nature, 341. 

 Watches, Clocks and, 480. 

 VV ter a compound body, 353. 



a form of matter, 59. 



Action of, in Geography, 6o3. 



All about, 59. 



as ice, 355. 



as steam, 355. 



Buoyancy of, 67. 



Chemistry of, 352. 



decomposed by electricity, 226. 



Distillation of, 356. 



Effects of heat on, 82. 



Evaporation of, 7. 



freezing by evaporation, 85. 



Fresh, in the sea, 611. 



hot, grows lighter, 81. 



Land and, 603. 



Mineral, 372. 



Petrification of, 357. 



Pressure of, 60. 



Sea, composition of, Cio. 



Water, Spring, 353. 



,, sustained by air, 59. 

 ,, The force of, 60. 



the unit of specific gravity, 70. 

 Water-press, The, 61. 

 Water-ram, The, 71. 

 Waterspout, Cause of the, 643. 

 Waterspouts, How to destroy, 643. 

 Water-wheels, 71. 

 Waves, Height of the, 613. 

 ,, Hurricane, 613. 

 ,, Movement of the, 612. 

 , , Standing and progressive, 169. 



Tidal, 613. 

 Way, Milky, 553. 

 Wcalden formations, The, 588. 



,, Fauna of, 589. 



Flora of, 589. 

 Weather, Danger of forecasting, 655. 

 forecasts, 651. 

 indications, 656. 

 Rules for prophesying, 656. 

 Weather-glass, The, 53. 

 Weight, Combining or atomic, 309. 



,, Definition of, 22. 

 Well tube, The, 455. 

 Wells, Artesian, 604. 



Gas, 606. 

 ,, Instantaneou.' 4.57. 



.; Oil, 606. 



Wheatstone's telegraph, 242. 

 Whispering galleries, 172. 

 Wind, Pressure of the, 632. 



,, Use of the, 633. 

 Wind, Velocity of the, 630. 

 Windows, Double, 757. 

 Winds, Air currents and, 629. 



,, Cause of, 629. 



List of local, 631. 



Trade, 630. 

 Wine, Spirits of, 418. 

 Wire-drawing, 398. 

 Wollaston's bulb, 91. 

 World, Study of the, i. 

 Worms, The, 714. 

 Writing machine, The, 246. 

 Wings, Best form for, 450. 



Yachts, Canadian ice, 463. 

 ,, Double sailing, 402. 

 Yellow spot, The, 140. 



Zamboni pile, 221. 

 Zeolites, 440. 

 Zinc, Use of, 403, 446. 

 Zodiac, Signs ot the, 471. 

 Zodiacal light, The, 500. 

 Zoology, Definition ol, joo. 

 Zootrope, 'Jhe, 121. 



