viii The Preface. 



(hewing how great the power 9 of the at- 

 traEiion of acid fulphureous particles 

 mufi be at fome little diflance from the 

 point of contaEl, to be able mofi readily 

 tofubdue and fix elaflick aereal parti-* 

 clesy which repel with a force fuperior 

 to vafl incumbent preffures : Which 

 particles we find are thereby changed 

 from aflrongly repelling, to as Jlrongly 

 an attraEling Jlate : And that elafli- 

 city is no immutable property of air, 

 is further evident from thefe Experi- 

 ments ; becaufe it were impoffible for 

 fuch great quantities of it to be confined 

 in the fubjlances of Animals and Vege- 

 tables^ in an elaflick jlate, without rend- 

 ing their c&nfiituent parts with a vafl 

 explofion. 



I have been careful in making, and 



faithful in relating the rejult of thefe 



'Experiments ', and wifh I could be as 



happy in drawing the proper inferences 



from 



