xiv LIST OF ILLUSTRATIONS 



FIG. PAGB 



20. Priestley's Apparatus (Second Plate) .... 89 



21. Lavoisier's Apparatus for Collecting the Gas produced 



by Heating Red-lead and Charcoal in an Iron 

 Retort 96 



22. Lavoisier's large Burning Glass . . ... 100 



23. Crystals of Calc-Spar . . . . . . .105 



24. Stalactite, /.<?., Chalk deposited by the escape of 



Fixed Air from Dripping Water .... 106 



25. Lavoisier's Apparatus for decomposing Steam in a 



red-hot gun-barrel 119 



26. Monge's Apparatus for exploding Hydrogen and 



Oxygen in an exhausted globe .* . . . 120 



27. Volta's Eudiometer 123 



28. Dumas's Apparatus for determining the Composition 



of Water 126 



29. Morley's Apparatus for measuring the Density of 



Oxygen . . 129 



30. Morley's Palladium-tube for weighing Hydrogen . 130 



31. Morley's Combustion-tube . . . .... 131 



32. Morley's Apparatus for the Combustion of Hydrogen 



and Oxygen . . 132 



33. Lavoisier's Apparatus for the Combustion of Spirit 



of Wine 147 



34. Dumas and Stas's Apparatus for the Combustion of 



Graphite and of Diamonds 149 



35. Stas's Apparatus for the Combustion of Carbonic 



Oxide 152 



36. Rhombic Crystals of Sulphur 1.63 



37. Stoppered flask used by Priestley in preparing 



"Vitriolic Acid Air" . . . . . . . 165 



38. Large Cube of Galena 173 



39. Cavendish's Apparatus for Sparking Air over 



Mercury 189 



40. Gray's Apparatus for determining the Composition 



of Nitric Oxide . . . - 207 



