﻿236 
  Scientific 
  Intelligence. 
  

  

  lines. 
  From 
  the 
  last 
  the 
  mean 
  surface-velocity 
  deduced 
  between 
  

   the 
  first 
  and 
  third 
  coseismals 
  is 
  2955 
  feet 
  per 
  second. 
  

  

  In 
  regard 
  to 
  the 
  origin 
  of 
  the 
  earthquake 
  the 
  conclusion 
  is 
  

   reached 
  that 
  it 
  was 
  due 
  to 
  a 
  slip 
  along 
  a 
  fault 
  many 
  miles 
  in 
  length 
  

   having 
  a 
  general 
  northwest 
  and 
  southeast 
  direclion 
  and 
  passing 
  

   very 
  near 
  to 
  Hereford. 
  Further 
  that 
  there 
  were 
  two 
  foci, 
  one 
  to 
  

   the 
  northwest 
  near 
  Hereford 
  some 
  eight 
  miles 
  in 
  length, 
  and 
  a 
  

   second, 
  southeast 
  and 
  near 
  lloss, 
  about 
  six 
  miles 
  in 
  length. 
  

   Between 
  these 
  there 
  was 
  an 
  undisturbed 
  portion 
  of 
  the 
  fault 
  

   about 
  two 
  miles 
  in 
  length. 
  The 
  fault-slip 
  at 
  the 
  Hereford 
  focus 
  

   took 
  place 
  a 
  few 
  seconds 
  before 
  that 
  at 
  the 
  Ross 
  focus, 
  hence 
  the 
  

   distinctly 
  noted 
  double 
  series 
  of 
  vibrations. 
  The 
  position 
  of 
  the 
  

   fault-line 
  is 
  located 
  within 
  the 
  area 
  of 
  the 
  Old 
  Red 
  Sandstone, 
  

   but 
  its 
  exact 
  geological 
  relations 
  have 
  not 
  been 
  established, 
  

   though 
  it 
  is 
  plausibly 
  connected 
  with 
  a 
  well-recognized 
  anti- 
  

   clinal 
  in 
  the 
  neighborhood, 
  bounded 
  on 
  three 
  sides 
  by 
  faults, 
  one 
  

   of 
  which 
  has 
  nearly 
  the 
  direction 
  of 
  the 
  fault-line 
  above 
  men- 
  

   tioned. 
  

  

  3. 
  First 
  Appe7idix 
  to 
  the 
  Sixth 
  Edition 
  of 
  DancCs 
  System 
  of 
  

   Mineralogy, 
  by 
  Edavaed 
  S. 
  Dana 
  ; 
  pp. 
  x 
  and 
  75. 
  New 
  York, 
  

   1899 
  (John 
  Wiley 
  & 
  Sons). 
  — 
  The 
  sixth 
  edition 
  of 
  Dana's 
  System 
  

   of 
  Mineralogy 
  was 
  issued 
  in 
  the 
  early 
  part 
  of 
  1892. 
  In 
  the 
  seven 
  

   years 
  that 
  have 
  passed, 
  the 
  additions 
  to 
  mineralogical 
  literature 
  

   have 
  been 
  numerous 
  and 
  important 
  ; 
  a 
  summary 
  of 
  these 
  is 
  given 
  in 
  

   the 
  Appendix 
  now 
  published, 
  which 
  thus 
  completes 
  the 
  System 
  to 
  

   1899. 
  The 
  prefatory 
  note 
  states 
  as 
  follows 
  : 
  "This 
  Appendix 
  

   contains, 
  first 
  of 
  all, 
  full 
  descriptions 
  of 
  the 
  species 
  announced 
  as 
  

   new 
  since 
  the 
  publication 
  of 
  the 
  System. 
  There 
  are 
  no 
  fewer 
  

   than 
  one 
  hundred 
  and 
  seventy 
  names 
  here 
  included, 
  and 
  their 
  

   place 
  in 
  the 
  general 
  scheme 
  of 
  classification 
  adopted 
  in 
  the 
  System 
  

   is 
  shown 
  in 
  the 
  classified 
  list 
  given 
  in 
  the 
  Introduction. 
  In 
  addi- 
  

   tion 
  to 
  the 
  description 
  of 
  new 
  minerals 
  this 
  Appendix 
  is 
  intended 
  

   to 
  contain 
  also 
  references 
  to 
  all 
  important 
  papers 
  on 
  mineral 
  

   species 
  published 
  during 
  the 
  period 
  named 
  ; 
  with 
  each 
  reference 
  

   is 
  given 
  a 
  concise 
  statement 
  of 
  its 
  character, 
  and 
  so 
  far 
  as 
  possible 
  

   a 
  summary 
  of 
  its 
  contents. 
  Since, 
  however, 
  the 
  additions 
  to 
  

   mineralogical 
  literature 
  have 
  been 
  very 
  numerous, 
  it 
  has 
  been 
  

   necessary, 
  in 
  order 
  to 
  keep 
  this 
  work 
  within 
  reasonable 
  compass, 
  to 
  

   adhere 
  rigidly 
  to 
  a 
  system 
  of 
  extreme 
  brevity 
  oi 
  expression 
  and 
  

   conciseness 
  of 
  arrangement. 
  All 
  minerals 
  named 
  are, 
  for 
  con- 
  

   venience, 
  placed 
  in 
  alphabetical 
  order. 
  . 
  . 
  . 
  The 
  Bibliography 
  

   includes 
  the 
  full 
  titles 
  of 
  prominent 
  volumes 
  published 
  since 
  1891." 
  

  

  4. 
  Minerals 
  of 
  Mexico. 
  — 
  Boletin 
  del 
  Inslituto 
  Geologico 
  de 
  

   Mexico, 
  num. 
  II, 
  pp. 
  157, 
  4to. 
  Mexico, 
  1898. 
  — 
  The 
  latest 
  number 
  

   of 
  the 
  Bulletin 
  published 
  by 
  the 
  Geological 
  Institute 
  of 
  Mexico 
  

   contains 
  a 
  full 
  and 
  valuabh' 
  catalogue 
  of 
  the 
  mineral 
  species 
  

   found 
  in 
  the 
  country, 
  prepared 
  by 
  Prof. 
  Jose 
  G. 
  Aguilera. 
  In 
  it 
  

   the 
  minerals 
  are 
  arranged 
  according 
  to 
  the 
  classification 
  in 
  Dana's 
  

   System, 
  the 
  individual 
  localities 
  being 
  given 
  fully 
  in 
  connection 
  

   with 
  each 
  species. 
  

  

  