XI 1 



CONTENTS 



CHAPTER PAOR 



XVIII. LUMINOSITY OF FLAMES 272 



XIX. PETROL 280 



XX. COAL-TAR ... . 298 



XXI. PRODUCTION or DYES ..... 310 



XXII. DRUGS 333 



XXIII. PERFUMES AND ESSENTIAL OILS . . . 342 



XXIV. VEGETABLE FIBRE AND PRODUCTS FROM CELLULOSE 356 

 XXV. RUBBER 363 



XXVI. EXPLOSIVES 374 



XXVII. FIXATION OF ATMOSPHERIC NITROGEN 393 



PAET IV 



MODERN PROGRESS IN ORGANIC CHEMISTRY 



XXVIII. SUGAR . . 411 



XXIX. PROTEINS OR ALBUMINOUS SUBSTANCES . . 424 



XXX. NATURAL COLOURS 439 



XXXI. ENZYMES 448 



XXXII. ORGANIC CHEMISTRY 456 



APPENDI^: . . . . . . .471 



INDEX 483 



