﻿382 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [May 
  25, 
  

  

  who 
  further 
  considers 
  that 
  there 
  must 
  have 
  been 
  two 
  shocks 
  — 
  the 
  

   first 
  at 
  2 
  h 
  35 
  m 
  , 
  and 
  another 
  at 
  3 
  h 
  30 
  m 
  . 
  

  

  In 
  some 
  places 
  four 
  vibrations 
  are 
  said 
  to 
  have 
  been 
  felt, 
  but 
  in 
  

   others 
  one. 
  No 
  sound 
  was 
  heard 
  in 
  one 
  locality, 
  and 
  loud 
  explo- 
  

   sions 
  in 
  others. 
  The 
  rocking 
  of 
  the 
  ground 
  appears 
  to 
  have 
  con- 
  

   tinued 
  for 
  two 
  minutes 
  in 
  one 
  place, 
  for 
  one 
  minute 
  in 
  others, 
  and 
  

   for 
  only 
  a 
  few 
  seconds 
  in 
  many 
  localities. 
  The 
  latest 
  shock 
  is 
  sup- 
  

   posed 
  to 
  have 
  been 
  noticed 
  at 
  Swansea 
  and 
  Nailsworth, 
  as 
  late 
  as 
  

   4 
  a.m., 
  the 
  earlier 
  vibration 
  having 
  been 
  felt 
  at 
  both 
  places. 
  The 
  

   time 
  at 
  which 
  the 
  principal 
  shock 
  occurred 
  at 
  different 
  places 
  ranges 
  

   from 
  3 
  h 
  to 
  3 
  h 
  30 
  m 
  ; 
  this 
  discrepancy 
  may 
  be 
  accounted 
  for 
  by 
  the 
  

   difference 
  in 
  the 
  clocks 
  at 
  the 
  various 
  localities 
  ; 
  and 
  it 
  is 
  probable 
  

   that 
  some 
  difference 
  in 
  the 
  time 
  of 
  the 
  shock 
  may 
  be 
  attributed 
  to 
  the 
  

   variations 
  of 
  the 
  earth's 
  structure 
  in 
  places 
  distant 
  from 
  each 
  other. 
  

  

  The 
  concussion 
  was 
  severe 
  at 
  Hereford 
  and 
  its 
  vicinity, 
  Pontypool, 
  

   Kingsdown 
  and 
  Redland 
  (Bristol), 
  Sedgely 
  Beacon 
  and 
  Lyerney 
  

   (Gloucestershire). 
  It 
  was 
  likewise 
  distinctly 
  felt 
  at 
  Wellington 
  and 
  

   Taunton 
  in 
  Somersetshire. 
  

  

  The 
  area 
  disturbed 
  is, 
  in 
  a 
  direct 
  line, 
  about 
  250 
  miles 
  in 
  length 
  

   by 
  180 
  miles 
  in 
  breadth. 
  

  

  The 
  oscillations 
  were 
  something 
  more 
  than 
  the 
  " 
  tremblores 
  " 
  so 
  

   common 
  in 
  the 
  volcanic 
  districts 
  of 
  South 
  America. 
  The 
  " 
  trem- 
  

   blore 
  " 
  is 
  a 
  mere 
  vibration 
  or 
  shaking 
  of 
  the 
  earth, 
  resembling 
  in 
  the 
  

   sensations 
  produced 
  the 
  exaggerated 
  tremulous 
  motion 
  of 
  a 
  steam- 
  

   vessel, 
  whereas 
  the 
  shock 
  of 
  the 
  6th 
  of 
  October 
  was 
  an 
  earth-wave, 
  

   referable 
  to 
  a 
  submarine 
  outburst 
  of 
  igneous 
  matter, 
  or 
  to 
  a 
  subsi- 
  

   dence 
  among 
  rock-masses, 
  or 
  to 
  a 
  pulsation 
  of 
  the 
  molten 
  masses 
  in 
  

   the 
  interior 
  of 
  the 
  earth. 
  

  

  According 
  to 
  Prof. 
  Perrey 
  *, 
  the 
  mean 
  horizontal 
  direction 
  of 
  British 
  

   earthquakes 
  is 
  " 
  from 
  south 
  to 
  north, 
  veering 
  more 
  or 
  less 
  to 
  the 
  east 
  

   or 
  west, 
  but 
  having 
  on 
  the 
  whole 
  a 
  direction 
  passing 
  through 
  the 
  

   probable 
  focus 
  of 
  the 
  Lisbon 
  earthquake, 
  and 
  of 
  the 
  Canary 
  Islands." 
  

   The 
  direction 
  of 
  the 
  concussion 
  on 
  the 
  6th 
  is 
  a 
  fact 
  tending 
  to 
  con- 
  

   firm 
  the 
  conclusions 
  referred 
  to 
  above, 
  as 
  was 
  also 
  the 
  shock 
  which 
  

   occurred 
  on 
  the 
  3rd 
  of 
  April, 
  1852t> 
  which, 
  though 
  less 
  extensive 
  in 
  

   its 
  effects, 
  appears 
  to 
  have 
  followed 
  the 
  same 
  course. 
  

  

  Mat 
  25, 
  1864. 
  

  

  The 
  Eev. 
  J. 
  Chadwick 
  Bates, 
  M.A., 
  F.R.A.S., 
  Incumbent 
  of 
  St. 
  

   Martin's, 
  Castleton 
  Moor, 
  near 
  Manchester; 
  William 
  Brooke, 
  Esq., 
  

   Brook 
  Street, 
  Manchester 
  ; 
  William 
  Henry 
  Nevill, 
  Esq,, 
  Llangen- 
  

   nech 
  Park, 
  Llanelly, 
  Carmarthenshire 
  ; 
  and 
  John 
  Pentecost, 
  Esq., 
  

   F.C.S., 
  1 
  Park 
  Street, 
  Torquay, 
  were 
  elected 
  Fellows. 
  

  

  The 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  * 
  Eep. 
  Brit. 
  Assoc. 
  1858, 
  p. 
  6. 
  

  

  t 
  Austin, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  viii. 
  p. 
  233. 
  

  

  