﻿424 
  Scientific 
  Intelligence. 
  

  

  millan 
  Co.) 
  — 
  -The 
  author 
  rightly 
  remarks 
  that 
  he 
  does 
  not 
  need 
  to 
  

   apologize 
  for 
  the 
  presentation 
  of 
  this 
  volume, 
  since 
  it 
  deals 
  with 
  

   a 
  subject 
  which 
  has 
  never 
  been 
  systematically 
  presented 
  in 
  a 
  

   single 
  volume 
  before. 
  The 
  value 
  of 
  the 
  work 
  is 
  largely 
  increased 
  

   by 
  the 
  fact 
  that 
  it 
  includes 
  not 
  simply 
  the 
  results 
  that 
  have 
  been 
  

   given 
  to 
  science 
  by 
  others, 
  but 
  those 
  which 
  the 
  author 
  himself 
  

   has 
  obtained 
  through 
  a 
  number 
  of 
  years 
  of 
  investigation. 
  The 
  

   subject 
  is 
  one 
  of 
  the 
  highest 
  interest, 
  not 
  only 
  from 
  the 
  strictly 
  

   scientific 
  side, 
  but 
  also 
  to 
  those 
  who 
  are 
  concerned 
  with 
  the 
  use 
  

   of 
  building 
  stones 
  in 
  general. 
  

  

  Part 
  I 
  discusses 
  the 
  mineral 
  constituents 
  of 
  rocks, 
  also 
  their 
  

   general 
  characters 
  and 
  occurrences. 
  Part 
  II 
  gives 
  a 
  summary 
  

   and 
  classification 
  of 
  the 
  different 
  kinds 
  of 
  rocks. 
  Part 
  III, 
  which 
  

   contains 
  the 
  most 
  original 
  portion 
  of 
  the 
  work, 
  is 
  devoted 
  to 
  the 
  

   weathering 
  of 
  rocks, 
  with 
  a 
  discussion 
  of 
  the 
  various 
  methods 
  by 
  

   which 
  this 
  is 
  accomplished, 
  and 
  the 
  results 
  in 
  various 
  cases 
  as 
  

   applied 
  to 
  rocks 
  of 
  different 
  natures. 
  The 
  manifestations 
  of 
  

   weathering, 
  the 
  rate 
  at 
  which 
  it 
  takes 
  place, 
  and 
  other 
  points 
  are 
  

   also 
  treated 
  of. 
  Part 
  IV 
  treats 
  of 
  the 
  transportation 
  and 
  redis- 
  

   tribution 
  of 
  rock 
  debris. 
  Part 
  V 
  is 
  devoted 
  to 
  the 
  " 
  regolith 
  " 
  or 
  

   mantle 
  of 
  unconsolidated 
  material 
  which 
  covers 
  a 
  large 
  part 
  of 
  

   the 
  earth's 
  surface, 
  including 
  both 
  sedentary 
  and 
  transported 
  

   materials. 
  A 
  particularly 
  interesting 
  portion 
  of 
  this 
  chapter 
  is 
  

   that 
  given 
  to 
  a 
  discussion 
  of 
  soils 
  in 
  their 
  different 
  aspects. 
  

  

  This 
  brief 
  summary 
  of 
  the 
  contents 
  of 
  this 
  admirable 
  volume 
  

   will 
  give 
  a 
  partial 
  idea 
  of 
  what 
  it 
  contains, 
  but 
  a 
  thorough 
  

   appreciation 
  of 
  its 
  value 
  and 
  originality 
  can 
  only 
  be 
  gained 
  by 
  

   careful 
  perusal. 
  Numerous 
  excellent 
  illustrations 
  accompany 
  the 
  

   text. 
  

  

  6. 
  Elemente 
  der 
  Mineralogie 
  begricndet 
  von 
  Carl 
  Frledrich 
  

   Nawnann. 
  Dreizehnte, 
  vollstandig 
  umgearbeitete 
  Auflage 
  von 
  

   Dr. 
  Ferdinand 
  Ziekel. 
  I. 
  Halfte: 
  Allgemeiner 
  Theil, 
  pp. 
  386. 
  

   Leipzig, 
  1897. 
  (Wilhelm 
  Engelmann.) 
  — 
  Twelve 
  years 
  have 
  now 
  

   passed 
  since 
  the 
  twelfth 
  edition 
  of 
  Naumann's 
  Mineralogie 
  was 
  

   issued 
  by 
  Prof. 
  Zirkel. 
  During 
  this 
  time 
  great 
  progress 
  has 
  been 
  

   made 
  in 
  the 
  science, 
  as 
  well 
  on 
  the 
  theoretical 
  as 
  on 
  the 
  descrip- 
  

   tive 
  side. 
  Mineralogists 
  will, 
  therefore, 
  welcome 
  warmly 
  this 
  

   admirable 
  treatise 
  in 
  its 
  new 
  and 
  thoroughly 
  revised 
  form. 
  The 
  

   first 
  half, 
  discussing 
  the 
  crystallographic, 
  physical, 
  and 
  chemical 
  

   properties 
  of 
  minerals, 
  is 
  now 
  given 
  to 
  the 
  public, 
  and 
  the 
  second 
  

   half, 
  containing 
  the 
  description 
  of 
  species, 
  is 
  promised 
  by 
  the 
  end 
  

   of 
  the 
  present 
  year. 
  

  

  7. 
  An 
  Introduction 
  to 
  the 
  Study 
  of 
  Meteorites, 
  with 
  a 
  List 
  of 
  

   the 
  Meteorites 
  represented 
  in 
  the 
  Collection. 
  British 
  Museum 
  

   (Natural 
  History), 
  Mineral 
  Department, 
  1896. 
  — 
  Dr. 
  Fletcher 
  

   has 
  recently 
  given 
  to 
  the 
  public 
  a 
  revised 
  edition 
  of 
  the 
  catalogue 
  

   of 
  the 
  British 
  Museum 
  collection 
  of 
  meteorites, 
  including 
  a 
  con- 
  

   siderable 
  number 
  of 
  specimens 
  not 
  noted 
  in 
  the 
  catalogue 
  of 
  

   1894. 
  

  

  