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  NOTES 
  AND 
  DIAGRAMS 
  ILLUSTRATIVE 
  OF 
  

  

  rush 
  of 
  air. 
  While 
  I 
  was 
  engaged 
  in 
  obtaining 
  materials 
  for 
  this 
  

   sketch, 
  Mr 
  Espy 
  penetrated 
  further 
  west 
  into 
  the 
  wood 
  and 
  beyond 
  

   it. 
  He 
  states 
  that 
  the 
  marks 
  on 
  the 
  trees 
  indicate 
  a 
  downward 
  motion 
  

   of 
  the 
  spout 
  at 
  this 
  place, 
  more 
  obscurely 
  made 
  out 
  than 
  in 
  the 
  other 
  

   cases 
  before 
  described. 
  The 
  nature 
  of 
  the 
  ground 
  to 
  the 
  west 
  of 
  the 
  

   wood 
  was 
  unfavourable 
  to 
  an 
  exact 
  determination 
  of 
  this 
  point, 
  but 
  it 
  

   is 
  probable 
  that 
  the 
  spout 
  was 
  raised, 
  for 
  a 
  short 
  distance, 
  above 
  the 
  

   surface 
  of 
  the 
  ground. 
  

  

  As 
  far 
  as 
  the 
  examination 
  of 
  the 
  different 
  diagrams 
  has 
  shown, 
  I 
  

   think 
  it 
  entirely 
  made 
  out 
  that 
  there 
  was 
  a 
  rush 
  of 
  air, 
  in 
  all 
  direc- 
  

   tions, 
  at 
  the 
  surface 
  of 
  the 
  ground, 
  towards 
  the 
  moving 
  meteor 
  ; 
  this 
  

   rush 
  of 
  course 
  carrying 
  objects 
  with 
  it. 
  That 
  the 
  meteor 
  did 
  not 
  

   always 
  extend 
  to 
  the 
  surface 
  of 
  the 
  ground, 
  and 
  when 
  at 
  the 
  surface 
  

   did 
  not 
  move 
  uniformly 
  either 
  in 
  velocity 
  or 
  in 
  direction. 
  

  

  In 
  figure 
  1 
  there 
  is 
  no 
  motion 
  towards 
  the 
  approaching 
  meteor 
  exhi- 
  

   bited 
  ; 
  and 
  this 
  appears 
  generally 
  to 
  have 
  been 
  the 
  case 
  along 
  its 
  track 
  • 
  

   when 
  moving 
  uniformly 
  and 
  reaching 
  to 
  the 
  surface 
  of 
  the 
  ground. 
  

   The 
  reason 
  of 
  this 
  readily 
  appears, 
  for 
  the 
  air 
  in 
  front 
  of 
  it 
  would 
  hardly 
  

   be 
  in 
  motion, 
  the 
  trees 
  carried 
  by 
  it 
  hardly 
  bent, 
  before 
  the 
  second 
  and 
  

   more 
  violent 
  action 
  would 
  prostrate 
  them 
  in 
  the 
  general 
  direction 
  of 
  

   the 
  motion 
  of 
  the 
  meteor. 
  

  

  Figures 
  2 
  and 
  3 
  exhibit 
  cases 
  of 
  this 
  motion 
  in 
  both 
  directions, 
  to- 
  

   wards 
  the 
  approaching 
  and 
  towards 
  the 
  receding 
  meteor. 
  But 
  there 
  

   is 
  no 
  evidence 
  here 
  that 
  the 
  spout 
  was 
  not 
  moving 
  along 
  the 
  surface. 
  

   In 
  the 
  case 
  of 
  figure 
  2, 
  the 
  motions 
  were 
  registered 
  by 
  the 
  effects 
  upon 
  

   the 
  ground, 
  and 
  the 
  easily 
  uprooted 
  trees 
  shown 
  in 
  figure 
  3, 
  fell 
  in 
  di- 
  

   rections, 
  with 
  one 
  exception, 
  between 
  10° 
  W. 
  of 
  N. 
  and 
  3° 
  N. 
  of 
  E. 
  : 
  the 
  

   meteor 
  moving 
  about 
  8° 
  N. 
  of 
  E., 
  and 
  to 
  the 
  north 
  of 
  the 
  orchard 
  con- 
  

   taining 
  the 
  trees. 
  

  

  The 
  disappearance 
  of 
  the 
  track 
  of 
  the 
  storm 
  is 
  first 
  satisfactorily 
  

   made 
  out 
  in 
  the 
  remarks 
  subsequent 
  to 
  those 
  upon 
  figure 
  3. 
  The 
  

   effect 
  of 
  a 
  second 
  case 
  of 
  the 
  sort 
  is 
  represented 
  in 
  figure 
  4, 
  where 
  

   around 
  a 
  circular 
  space, 
  in 
  which 
  the 
  tops 
  of 
  the 
  trees 
  were 
  found 
  

   lying 
  together, 
  is 
  a 
  ring 
  in 
  which 
  the 
  trees 
  generally 
  point 
  to 
  the 
  cen- 
  

   tral 
  space. 
  At 
  the 
  outlet, 
  where 
  the 
  storm 
  moved 
  on 
  its 
  track, 
  the 
  

  

  