r 158 ] 



SOME 



BRIEF INSTRUCTIONS 



FOR 



Etching or Engraving 



O N 



COPPER-PLATES, 



WITH 



AQ^UA FORT IS. 



T N the courfe of my performing the engrav- 

 ing or etching of the copper-plates contained 

 in my Natural Hiftory, I received not only the 

 inftru6tions of my friends, but bellowed fome 

 pains to examine fuch authors as had wrote on 

 the fubjedt of etching with Aqua Fortis, 



I could find little or nothing on that fubjed 

 originally wrote by any author of our own coun- 

 try ; 



