PHILOSOPHICAL 
TRANSACTIONS. 
L A Letter  from  Sir  William  Hamilton,  K.  B.  F.  R.  S. 
to  Sir  John  Pringle,  Bart.  P.  R.  S.  giving  an  Account 
of  certain  Sr  aces  of  Volcanos  on  the  Banks  of  the 
Rhine. 
_ _ From  on  board -a  Yacht  on  the  Rhine, 
k A Rj  near  Mayence,  Sept.  29,  1777. 
Read  Dec.  11,  A 3 I do  not  recoiled!  ever  to  have  heard 
of,  or  feen,  any  account  of  ancient 
volcanos  on  the  banks  of  this  river,  I have  the  pleafure 
of  fending  you  a few  imperfeft  remarks,  which  I have 
Vol.  LXVIII.  B juft 
