ADVERTISEMENT. 



MORE than twenty years have elapsed since the 

 publication of the first volume of the Society^ s Memoirs, 

 Jn this period five successive volumes have appeared , 

 the trvo last of which "jcere published in separate parts. 

 The first and second Jmve been reprinted, and a few 

 of the copies are still on sale , the third is out of print ; 

 and some of the fourth and fifth remain in the pub- 

 lisher's hands. — The progress of the experimental 

 Sciences has been so considerable of late years, as to 

 ■render ineligible the republication of Essays however 

 valuable originally. The inability, also, of procuring 

 a complete set of the Memoirs has deterred some 

 personsfrom purchasing the former volumes. These 

 considerations have induced the Society to covirnence 

 a second series, and they have accordiiigly detw- 

 minated this the first volume of the series ,• it being 

 also the sixth published by t/ie Society since its Insti- 

 tution in 1781. 



The Society wish it to be understood, as formerly, 

 that they do iwt consider themselves answerable for the 

 accuracy of the facts and reasoning in the several 

 Essays : but that the responsibility rests entirely with 

 the respective authors. 



Noveral)er 6, 1805. 



