568 



INDEX. 



Voltameters, on the thermal phe- 

 nomena of, 551. 



Water, on the boiling of, 78, 324. 



Watt's parallelogram, on a modifica- 

 tion of, 51. 



Wohler (Prof.) on the colouring mat- 

 ter of emeralds, 167- 



Woods (Dr. T.) on the relative 

 amounts of heat produced by the 



combination of ordinary and ozo- 

 nized oxygen, 1 06 ; on the mea- 

 surement of the chemical bright- 

 ness of various portions of the sun's 

 disk, 166. 



Zeiodelite, on a new application of, 

 326. 



Zircons, on the density and refractive 

 index of some, 234. 



END OF THE TWENTY-EIGHTH VOLUME. 



PRINTED EY TAYLOR AND .FRANCIS, 

 RED LION COURT, FLEET STREET. 



