SUBJECT INDEX 



389 



Vacuum, 56 fT.; power of, 28, 48 

 Valency, 336 



Van der Waals' equation, 304 

 Vapour pressure, Dalton's work 



on, 182 

 Venus, 33 



Viscosity, 95; laws of, 151 

 Voltaic series, i66; pile, 164, 167 

 Voltameter, 267 



Water, circulation on earth, 

 65 f.; composition of, 147; 

 Scheele's experiments with 142 



Water waves, 95 



Weight, 8s 



X-RAYS, 203, 348 



Zirconia, discovery of, i8i 



