CONTENTS 



PREFACE Vii 



MEMOIR OF THE LIFE AND WORK OF C. W. SCHEELE, 



WRITTEN FOR THE RE-ISSUE OF 1901 .... xiii 

 ESSAY 



I. ON FLUOR MINERAL AND ITS ACID 1 



II. ON FLUOR MINERAL 21 



III. CHEMICAL INVESTIGATION OF FLUOR ACID, WITH A VIEW TO 



THE EARTH WHICH IT YIELDS, BY MR. WIEGLEB . . 29 

 IV. ADDITIONAL INFORMATION CONCERNING FLUOR MINERAL, BY 



MR. MEYER 38 



V. ON MANGANESE, MANGANESIUM, OR MAGNESIA VITRARIORUM . 52 



VI. ON ARSENIC AND ITS ACID 105 



VII. REMARKS UPON SALT OF BENZOIN. 137 



VIII. ON SILEX, CLAY, AND ALUM . . . . . . .141 



IX. ANALYSIS OF THE CALCULUS VESICLE ..... 145 



X. METHOD OF PREPARING MERCURIUS DULCIS VIA HUMIDA . 157 

 XI. A CHEAPER AND MORE CONVENIENT METHOD OF PREPARING 



THE PULVIS ALGAROTHI . . . . . . .161 



XII. EXPERIMENTS UPON MOLYBD^NA 165 



XIII. EXPERIMENTS ON PLUMBAGO 177 



XIV. METHOD OF PREPARING A NEW GREEN COLOUR . . .185 

 XV. OF THE DECOMPOSITION OF NEUTRAL SALTS BY UNSLAKED 



LIME AND IRON 187 



XVI. ON THE QUANTITY OF PURE AIR WHICH IS DAILY PRESENT 



IN OUR ATMOSPHERE 190 



XVII. ON MILK AND ITS ACID . 195 



XVIII. ON THE ACID OF SACCHARUM LACTIS 204 



XIX. ON THE CONSTITUENT PARTS OF LAPIS PONDEROSUS, OR 



TUNGSTEN 210 



XX. EXPERIMENTS AND OBSERVATIONS ON ETHER . . . 220 



XXI. OBSERVATIONS ON A METHOD OF PRESERVING VINEGAR . 231 



xxix 



