LIST OF ILLUSTRATIONS xv 



PAGE 



Twinned Cubes of Fluor Spar 234 



Moissan's Apparatus for Preparing Fluorine . . 252 



The Voltaic Pile . . , 271 



The Voltaic Battery or " Crown of Cups " . . . 272 

 Boyle's Pneumatic Engine or Air Pump . . .321 

 Tube used in Boyle's Experiments on the Condensa- 

 tion of the Air 325 



Gay-Lussac's Apparatus for Measuring the Expan- 

 sion of Gases and Vapours . . . . . 328 

 Gay-Lussac's Apparatus for Comparing the Expan- 

 sion of Air with that of Soluble Gases and Vapours 329 

 Gay-Lussac and Thenard's Apparatus for the Com- 

 bustion of Organic Compounds . . . . 391 

 Berzelius's Apparatus for the Combustion of Organic 



Compounds . 392 



Liebig's Apparatus for the Combustion of Organic 



Compounds .. . .- ; . . . 395 

 Dewar's Atomic Heat Curve, with a Curve of Atomic 



Volumes . 472-473 



High-frequency Spectra 488 



High-frequency Spectra of the Elements . . . 489 



Deville's " Hot-cold " Tube 517 



Pebal's Apparatus for Proving the Dissociation of 



Sal-ammoniac 521 



H. B. Baker's Apparatus for Heating Dried Mixtures 



of Hydrogen and Oxygen . . . . 532 



