INDEX 



25 



References are to pages 



Volcanoes Continued 



Vesuvius 504-506 



on ocean floor 155 



Volta (discoverer of voltaic cell) 484 

 Voltaic ceil (in electricity) . . 485 



Volume 66,94 



Vulcanite (in magnetism) . . 480 



Water .... 98,100-107,127, 

 135-169, 170, 174-179, 196-207, 

 278, 311-313, 319, 324-327, 347, 

 385, 400-401, 425, 445, 447-449, 528 



a disinfectant 445 



a food 428 



a necessity to life-processes 



135, 425 

 a solvent .... 139-144, 167 



air in 141 



boiling-point of .... 100, 136 



buoyancy of 148-151 



composition of 135-136, 153, 167 



condensation of 136 



density of 137, 150 



diffusibility 139 



displacement on .... 149-150 

 effects of, upon life-develop- 

 ment 151-152 



effects of varying tempera- 

 tures upon 136-138 



energy in 137-138 



erosive power of . . . . 278-280 



evaporation of ... 101-107, 



136, 166, 278, 385, 528 



expansion of . . . 136-138,167 



freezing of . . 138, 141, 167, 279 



heat-absorption of . 138-139, 347 



infection of . 205-206, 447-449 



purification of polluted 



water 205-206 



life in . . . 151-152,400-401 

 of land due to ocean-evapo- 

 ration 166 



physical properties of . . . 151 



power of running . . . 174-176 



pressure in . 146-148, 167-168 



transmission of . 147-148, 168 



qualities of 144 



soil- .... 196-198,311-313, 

 319, 324-326 



Water Continued 



solutions in . 141-142, 167 ; 278 



sphere of activity of . 101-107, 



196-206 



evaporation .... 101-107 

 condensation into clouds 104 

 precipitation as rain. etc. . 104 

 run-off as lakes and rivers ' 



200-206 

 sinkage as artesian wells, 



springs, etc. . . . 196-198 



submergence in 150-151, 167-168 



submarine . . . 150-151, 167 



suspension of matter in . 142-144 



temperatures of . . 136-133, 142, 



167 



of salt solutions .... 142 

 vaporizing of ... 98-100, 136 



volume of 137, 167 



Waterfalls 526 



Waterspouts 231,245 



Waterways . 17, 19, 152-167, 169, 



171-174, 176-208, 213, 249-251, 



256-258, 514, 531-535, 546-548, 



552 



as a means of development . 190 

 as a means of transportation 196 

 effects of, upon climate . 241-243 

 effects of, upon shores . . 243-244 

 day vs. night ; summer 



vs. winter .... 243-244 

 Watt, James (inventor of steam 



engine) 470 



Waves. . . . 157-161,169,514 

 as builders and destroyers of 



land 159-161 



beaches 161, 251 



cliffs, promontories, sea- 

 caves 160 



crest of 157, 159 



motion of water in ... 157158 



" oil on water " 158 



trough of 157, 159 



volcanic action vs 514 



Wax 405,490 



Weather . . . 209-237,244-245 



temperature vs. 209-237, 244-245 



circulation of air . 215-216, 244 



winds. . . . 216-231,244 



