Xll CONTENTS. 



PAGE 



Mixture detonating by percussion : precautions, "T.. - 220 



Coloured fires, . . . . . 220 



Deodorising sulphuretted hydrogen, , "''. . 221 



Gases produced by action of solids on one another, . 221 

 Reduction of metals : lead, tin, bismuth, antimony, 



mercury, &c., . .. .- *- . 222 



Copper reduced from oxide of copper by hydrogen, . 223 



Concentrated nitric acid, .... 225 



Etching glass, .. . .. .. . . 225 



Engraving on copper and steel, . ' . * . . 226 

 Liquid produced from two solids : water of crystal- 

 lisation, . * :*.' t .'. . . 227 

 Acids from sugar, * r . . . * ' . . 228 

 Preparation of soap : cold process : boiling process, . 229 

 Glycerine, ...... 230 



Transparent soap, ..... 230 



6. PHYSICAL ADHESION AND ALLIED PHENOMENA OF SURFACE 



ACTION, ....... 231-262 



CHAPTER XVI. Condensation of Gases on the Surface of 



Solids,. ...... 231-241 



Distinction between surface attraction and occlusion, . 231 



Steel floats on water, ..... 232 



Absorption of gases by porous solids : charcoal, spongy 



metals, ...... 233 



To cleanse mercury, ..... 234 



Pyrophoric metals, ..... 235 



Combustion of coal gas, &c., without flame, . . 236 



Dobereiner's lamp, ..... 237 



Charcoal as sanitary agent, .... 239 



Filtration through charcoal, .... 240 



CHAPTER XVII. Mutual Adhesion of Solids and Liquids, . 241-254 



Silvering mirrors with tinfoil and mercury, . . 241 



Removal of substances from solution, . . . 242 



Decolorising by animal charcoal, . . . 243 



Dyeing silk and wool (animal fibres), . . . 244 



Dyeing vegetable fibres (cotton, linen, &c.) : mordants, 245 



Discharge colours, ..... 247 



Lakes, . . ."'.'. . . 248 



Ink, ...... 249 



Capillary attraction and repulsion, . . . 250 



