List of Illustrations xi 



FIG. PAGE 



88. Alum crystals 272 



89. Potassium chlorate crystals . . . .274 



90. Method of folding filter-paper . . . .275 



91. Action of steam on heated iron . . . 282 



92. Electrolysis of acidulated water . . . 284 



93. Laboratory preparation of hydrogen . . 285 



94. Filling balloon with hydrogen . . . 287 



95. Water produced by combustion of hydrogen . 288 



96. Explosion of mixture of hydrogen and air . 290 



97. Anomalous expansion of water . . . 292 



98. Kipp's generator ...... 295 



99. Composition of water by passage of hydrogen 



over heated copper oxide . . . 296 



100. U-tube eudiometer 299 



101. U-tube eudiometer with vapour-jacket . . 301 



102. Potassium sulphate and potassium bisulphate 



crystals . . . . . . .314 



