xiv Illustrations 



FACING 

 PAGE 



MICHAEL FARADAY (1791-1867) . 716 



A FAMILIAR INSTANCE OF THE CONVERSION OF A LIQUID INTO A SOLID . 717 

 Photo: J. J. Ward. 



CAST IRON is HARD AND BRITTLE AND CANNOT BE WELDED AS WROUGHT 

 IRON, BECAUSE THE FORMER CONTAINS A QUANTITY OF FOREIGN 

 MATERIAL, WHILE THE LATTER is ALMOST PURE METAL . . . 722 

 Photo: James's Press Agency. 



DIAGRAM SHOWING ARRANGEMENT AND WIRING OF COMPLETE ELECTRO- 

 PLATING PLANT 723 



Photo: W. Canning & Co. 



DIAGRAM OF AN ELECTRO-PLATING BATH, SHOWING THE METHOD OF 



HANGING SMALL ARTICLES IN THE DEPOSITING VAT FOR PLATING . 723 



A MOTOR FIRE-PUMP WITH CHEMICAL FIRE-ENGINE AND FIRE-ESCAPE . 728 

 Photo: reproduced by courtesy of Merryweather & Sons, London. 



NATURE'S TRANSFORMATIONS OF WATER ...... 728 



Photo: J. J. Ward. 



SIR HUMPHRY DAVY (1778-1829) 729 



Photo: Rischgitz Collection. 



JUSTUS VON LIEBIG (1803-1873) 729 



Photo: Rischgitz Collection. 



"THE CULLINAN DIAMOND" . 734 



Photo: James's Press Agency. 



THE YEAST PLANT (Saccharomyces) . . . . . . 734 



Photo: J. J. Ward. 



THE WINE-YEAST OR "CALIFORNIAN BEES" ...... 734 



Photo: J. J. Ward. 



MENDELEEFF ..... ...... 735 



Photo: Rischgitz Collection. 



THE LATE PROFESSOR SIR WILLIAM RAMSAY, K.C.B 735 



Photo: Russell & Sons, Southsea. 



LAVOISIER'S EXPERIMENTS ON RESPIRATION. MADAME LAVOISIER AT THE 



TABLE TAKING NOTES' . . ... 744 



NATURE'S CHEMISTRY .......... 745 



Photo: J. J. Ward. 



THE MARVELLOUS PRODUCTS OF COAL 745 



DYES FROM SHELLS OF THE SEA-SNAILS (Murex) ..... 746 

 Photo: J. J. Ward. 



