276  Papers  relative  to  an  Accident 
the  nearer  they  approached  to  be  one  fubftitute.  So  that 
bringing  the  two  fubftitutes  into  contact,  occafioned  the 
fame  phenomena  that  the  great  cylinder  did  alone : that 
is,  the  rounded  end  would  caufe  an  explofion  at  a confi- 
derable  diftance ; and  the  point  little  or  none,  notwith- 
ftanding  it  was  brought  almoft  clofe  to  the  fubftitute. 
exp.  xxxx.  But  if  motion  in  this  cafe  was  introduced, 
during  the  contadt  of  the  two  fubftitutes,  the  point  was 
ftruck  at  nine  inches  and  an  half  diftance  from  the  ball. 
The  motion  employed  upon  this  occafion  was  by  the 
hand  only,  which  held  a proper  ftand  with  the  point 
upon  it;  and  this  point  communicated  by  a wire  with 
fN 
the  well. 
eleventh  observation.  Now  the  nearer  the  two 
fubftitutes  were  brought  together,  the  nearer  they  re- 
prefented  one  cloud;  and,  confequently,  as  hath  been 
obferved  before,  the  matter  of  lightning  would  pafs  from 
one  to  the  other  in  thefe  cafes  more  I'eadily,  and  without 
permitting  fb  great  an  accumulation  to  take  place  as  was 
experienced  in  the  nineteenth  experiment,  when  the  fe- 
parated  fubftitutes  ftruck  at  the  greateft  diftance. 
To  occafion  fuch  a ftroke,  it  is  not  only  neceflary  to 
have  an  accumulation  of  the  fluid,  but  that  accumula- 
tion muft  be  kept  up,  as  it  were,  and  inereafed  fuddenly, 
before  a ftroke  in  this  cafe  can  pofiibly  take  place;  as 
appeared 
