INDEX.

safety, 32; of internal-combustion engine, 89. Valves of the heart, 357. Veins, 358; capillary, 358; pulmonary, 361. Ventral segments, 291. Ventricles, 357. Vibration of columns of air, 288, 289; of rods, 287; of strings, 278; of strings, conditions regulating, 278. Viper , the, 86. Virag, Pollak—high-speed telegraphy, 136. Vitreous humour, 246. Voltage, 121, 161. Vowel sounds, 308. Wasborough, Matthew, 51. Watches, first, 412. Water cock, 365 ; engines, 375; gauge, 35, 36 ; jacket, 19, 95; meter, 368 ; supply, 371; turbines, 174, 376;