<o ' 



The fluctuating state of Mineralogical knowledge makes 

 it commendable to postpone the Systematic Index that 

 might be expected to this Volume. It is therefore proposed 

 to give a general Systematic Index to the whole work, at 

 the end of the next volume. In the mean time, I beg leave 

 to say, that I have published the First Part of a Catalogue 

 of British Minerals for public Criticism and Amendment; 

 that it may be made by more help and experience — more 

 complete. This part contains the Combustibles and Earths, 

 with the specific names of most of the Exotic Minerals 

 which are not known to this Country, to show their places 

 in the System. The British Minerals have references to 

 British Mineralogy and Habitats, &c. 



