960 



I N D E X. 



Uranium, on the disintegration pro- 

 ducts of, 419. 



Vacuum valves, on electric, 1. 



Valency, on the question of, in 

 gaseous ionization, 547. 



Vaporization of liquids, on the latent 

 heat of, 263. 



Vincent (Dr. J. H.) on electrical 

 experiments with mercury con- 

 tained in tubes, 506. 



Wade (A.) on the eastern desert of 

 Egypt, 467 ; on the rocks of north- 

 eastern Montgomeryshire, 467. 



Welmelt cathode, on rays of positive 

 electricity from the, 926. 



Westphal (Dr. W.) on the question 

 of valency in gaseous ionization, 

 547. 



Wheeler (Prof. L. F.) on the re- 

 flexion of light at certain metal- 

 liquid surfaces, 229. 



Wilde (Dr. H.) on the origin of 

 cometary bodies and Saturn's 

 rings, 741 ; on the periodic times 

 of Saturn's rings, 949. 



Wire gratings, on polarization of 

 undiffracted long-waved heat rays 

 by, 322. 



Wood (Prof. R.W.) on the resonance 

 spectra of iodine vapour and their 

 destruction by gases of the helium 

 group, 469. 



X-rays, on the mode of ionization 

 by, 222. 



Zinc, on the positive ionization from 

 salts of, 669. 



END OF THE TWENTY-SECOND VOLUME. 



Printed by Taylor and Francis, Red Lion Court, Fleet Street. 



