xxx CONTENTS 



ESSAY PAGE 



XXII. EXPERIMENTS ON THE COLOURING MATTER IN BERLIN OR 



PRUSSIAN BLUE ........ 233 



XXIII. ON THE INFLAMMABLE PRINCIPLE IN CRUDE CALCAREOUS 



EARTH 245 



XXIV. SOME INCIDENTAL REMARKS ON THE AFFINITY OF BODIES . 254 

 LETTER FROM MR. SCHEELE TO DR. CRELL .... 259 

 ON THE CRYSTALLISATION OF THE ACID OF LEMONS . . 260 

 DISCOVERY OF A PECULIAR SWEET AND VOLATILE MATTER, 



WHICH IS A CONSTITUENT PART OF EXPRESSED OILS 



AND THE FAT OF ANIMALS ...... 262 



LETTER FROM MR. SCHEELE TO DR. CRELL .... 264 



LETTER FROM THE SAME TO THE SAME 266 



XXV. UPON THE RESEMBLANCE WHICH VEGETABLE ACIDS BEAR TO 

 ONE ANOTHER, PARTICULARLY THOSE OF MUST AND 



SUGAR BY DR. CRELL 268 



ON THE CONVERSION OF VINEGAR INTO ACID OF TARTAR, OR 



OF SUGAR, BY DR. CRELL 271 



EXTRACT OF A LETTER FROM DR. CRELL TO MR. D'ARCET . 275 

 DISSERTATION ON PRUSSIAN BLUE, PART II 280 



INDEX , 291 



