﻿FOURTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I907 
  39 
  

  

  in 
  a 
  sparsely 
  inhabited 
  region, 
  which 
  accounts 
  for 
  the' 
  small 
  damage 
  

   and 
  loss 
  of 
  life 
  that 
  ensued. 
  

  

  May 
  28. 
  Slight 
  trembling 
  indicated 
  on 
  the 
  north-south 
  pen- 
  

   dulum, 
  continuing 
  at 
  intervals 
  until 
  5 
  p. 
  m. 
  

  

  May 
  31. 
  Faint 
  tremors 
  of 
  seismic 
  nature. 
  

  

  June 
  1. 
  Small 
  disturbance, 
  coincident 
  with 
  a 
  slight 
  shock 
  in 
  

   Ecuador. 
  

  

  June 
  4. 
  A 
  distant 
  earthquake 
  traced 
  for 
  over 
  an 
  hour 
  on 
  the 
  

   north-south 
  pendulum. 
  

  

  June 
  28. 
  Small 
  tremors. 
  

  

  July 
  1. 
  This 
  disturbance 
  would 
  seem 
  to 
  have 
  been 
  a 
  severe 
  

   one, 
  and 
  perhaps 
  5000 
  miles 
  distant 
  in 
  a 
  southerly 
  direction. 
  The 
  

   Havana 
  station 
  reported 
  its 
  passage 
  at 
  7.43 
  a. 
  m. 
  It 
  was 
  probably 
  

   submarine. 
  

  

  August 
  17. 
  A 
  thickening 
  of 
  the 
  line 
  traced 
  by 
  the 
  north-south 
  

   instrument, 
  breaking 
  into 
  minute 
  waves 
  20 
  minutes 
  after 
  the 
  be- 
  

   ginning 
  

  

  September 
  2. 
  A 
  very 
  distant 
  shock, 
  as 
  shown 
  by 
  the 
  long 
  

   duration 
  of 
  the 
  preliminary 
  tremors 
  and 
  by 
  the 
  continuance 
  of 
  the 
  

   record 
  for 
  an 
  interval 
  of 
  nearly 
  four 
  hours. 
  Vibrations 
  much 
  more 
  

   pronounced 
  on 
  the 
  north-south 
  machine. 
  The 
  Isle 
  of 
  Wright 
  sta- 
  

   tion 
  reported 
  its 
  passage 
  later 
  than 
  American 
  stations 
  so 
  that 
  it 
  

   undoubtedly 
  came 
  from 
  the 
  Pacific. 
  

  

  September 
  23. 
  Vibrations 
  of 
  small 
  amplitude 
  throughout. 
  

  

  September 
  24. 
  North-south 
  pendulum 
  showed 
  a 
  condition 
  of 
  

   slight 
  instability, 
  due 
  +0 
  a 
  small 
  earthquake. 
  Disturbance 
  recorded 
  

   at 
  Washington. 
  

  

  MINERALOGY 
  

  

  In 
  the 
  section 
  of 
  mineralogy, 
  the 
  research 
  work 
  has 
  included 
  an 
  t 
  

   investigation 
  of 
  the 
  crystal 
  forms 
  of 
  the 
  calcite 
  from 
  Rossie, 
  St 
  

   Lawrence 
  co., 
  a 
  study 
  of 
  the 
  crystal 
  forms 
  and 
  twinning 
  habit 
  of 
  

   the 
  new 
  occurrence 
  of 
  calcite 
  from 
  Sterlingbush, 
  Lewis 
  co., 
  and 
  a 
  

   study 
  of 
  the 
  minerals 
  from 
  Newcomb, 
  Essex 
  co. 
  The 
  work 
  on 
  the 
  

   Rossie 
  calcite 
  which 
  yielded 
  two 
  forms 
  new 
  to 
  the 
  species 
  and 
  T 
  2 
  

   which 
  are 
  new 
  to 
  the 
  occurrence, 
  has 
  amply 
  demonstrated 
  the 
  value 
  

   of 
  detailed 
  crystallographic 
  study 
  on 
  a 
  large 
  number 
  of 
  specimens 
  

   from 
  localities 
  even 
  as 
  well 
  known 
  as 
  this 
  one. 
  The 
  work 
  on 
  the 
  

   Newcomb 
  minerals, 
  which 
  is 
  still 
  in 
  progress, 
  has 
  already 
  yielded 
  a 
  

   new 
  form 
  for 
  arsenopyrite 
  and 
  three 
  new 
  forms 
  for 
  wernerite 
  as 
  

   well 
  as 
  a 
  ratio 
  for 
  the 
  axial 
  elements 
  of 
  the 
  latter 
  mineral 
  very 
  

   close 
  to 
  that 
  determined 
  by 
  vom 
  Rath. 
  1 
  The 
  tourmalin 
  crystals 
  

  

  'Pogg. 
  Ann, 
  1863. 
  P- 
  119-254, 
  262, 
  

  

  