INDEX 



237 



Vaporization, 74. 



Velocity, 51 ; of light waves, 110 ; 



of sound waves, 97. 

 Vibrating bodies, 94, 95. 

 Vibration, 9, 91, 92, 94; forced, 



98, 99; of the ether, 110; 



rate of, 92; sympathetic, 98, 



99. 



Voice, 105. 

 Volt, 146. 



Voltaic cell, 130, 140. 

 Volume, 27 ; changes of, 72, 73. 



Water, composition of, 202 ; ex- 

 pansion of, 73; mineral, 202; 

 use of, 190; vapor, 210. 



Watt, 146. 



Wave, 91 ; length, 92, 103 ; light, 

 108, 109, 110; motion, 91; sound, 

 93. 



Weather changes, 36. 



Wedge, 65. 



Weight, 20. 



Welding, 12. 



Wheel and axle, 64. 



White light, 125, 126. 



Winds, 82. 



Wireless telegraphy, 169. 



Wood, 213. 



Work, 60 ; electrical, 146. 



Yeast, 227. 



Zinc, 147, 200 ; plate, 142. 



