T O 



HER ROYAL HIGHNESS 



THE 



Princefs Dowager of WALES. 



MADAM, 



N I MA TED by the Attention 

 Your Royal Highnefs conde- 

 fcended to beftow, on many of 

 the Subftances defcribed in the 

 enfuingPages, Ihave purfued my 

 Enquiries concerning them, with an Ardour 

 that only fuch an Influence could inlpire. 



The minuteft Works of Creation are not 

 always the leaft wonderful : And though 

 the Element, of which thefe are Natives, 



a 2 prohibits 



