it PREFACE. 



nnd there is reafon to think that they have been 

 of great utility. 



The pieces which compofc this volume are 

 not inferior in value to thofe already before 

 the Englifh reader : The Hillory of Chemif- 

 try is no where traced with greater erudition 

 and good fenfc, than in the two firfl of thefe 

 Eflays. The Arrangement of Fulfils, the Com- 

 bination of certain Metals, the Analyfis of fome 

 Swedifh mineral Waters, with a few other mat- 

 ters, perhaps of Hill higher importance than any 

 of thefe, are the fubje.ds which occupy the reil 

 of the volume. 



Whether confidercd as original records of a 

 number of chemical facts, communicated up- 

 on the very bell authority, or viewed as models 

 of philofophical inveiligation, the reafonings 

 and procelles of which may be imitated with ad- 

 vantage in either of thefe lights, the contents 

 of this volume will be acknowledged to have 

 been worthy of the tranllator's rfciiris. Their u- 

 tjlity may perhaps be the greater, becaufc the 

 propagation of a new theory, formed to pervade 

 the whole fcience of Chemillry, renders it of 

 confequence for the Undent to examine that 

 \\hich has fo long prevailed, in all its parts, and 

 to view it in connection with every fad which lias 

 been di (covered ; in order that he may determine 

 whether to adhere to the doctrine of STAH'L, or 

 to cUlopt the opinions of LAVOISIER, 



