Velocities  of  Cannon  Balls , See.  85 
experiments  were  made,  are  fo  fruitful  in  confequences, 
that,  in  conjunction  with  the  effects  refulting  from  the 
refiftance  of  the  medium,  they  feem  to  be  fufficient  for 
anfwering  all  the  enquiries  of  the  fpeculative  philofo- 
pher,  as  well  as  thofe  of  the  practical  artillerift. 
