CONTENTS 



XVIII. LIGHT : EEFLECTION, EEFRACTION, DISPERSION, 



AND COLOUR 274 



XIX. THE SPECTRUM 304 



XX. -INTERFERENCE OF LIGHT 321 



XXI. LANTERN POLARISING APPARATUS .... 338 

 XXII. POLARISED LIGHT 349 



XXIII. HEAT 385 



XXIV. MAGNETISM AND ELECTRICITY 394 



XXV. SCIENTIFIC DIAGRAMS 411 



APPENDIX ...,..,.. 417 

 INDEX ..... . 441 



