XX 



Water, Capacity for Heat of (G-riffiths), 479; Dielectric Constant of (Dewar and 

 Fleming), 2. 



Water Besearch Committee, Fifth Eeport to, 415. 



Water Vapour, Condensation of (Wilson), 240. 



Wilde (Henry) On the Magnetisation Limit of Iron, 291. 



Wilson (C. T. R.) Condensation of Water Vapour in the presence of Dust-free 



Air and other G-ases, 240. 

 Wislicenus (Johannes) elected a Foreign Member, 220. 



X-ray tube, adjustable (Swinton), 222. 



X-rays (Thompson) , 481 ; of Different Penetrative Value, Production of (Swinton), 

 222; Production of (Swinton), 79. 



ERRATUM. 



Page vi, lines 13, 14. For Symes, read Syme. 



END OP THE SIXTY-EIEST VOLUME. 



HARBISON AND SO'JS, PRINTERS IN ORD1NAKY TO I1EB MAJESTY, ST. MARTIN 's LAKE. 



