﻿388 
  Scientific 
  Intelligence. 
  

  

  sion, 
  erosion, 
  volcanism, 
  brief 
  erosion, 
  subsidence, 
  uplift, 
  erosion, 
  

   volcanism, 
  subsidence, 
  uplift, 
  erosion, 
  volcanism, 
  submergence." 
  

   The 
  dates 
  of 
  all 
  these 
  events 
  remain 
  to 
  be 
  determined. 
  The 
  con- 
  

   clusions 
  reached 
  regarding 
  the 
  origin 
  of 
  barrier 
  reefs 
  and 
  atolls 
  

   is 
  that 
  they 
  develop 
  on 
  antecedent 
  platforms 
  and 
  could 
  have 
  

   existed 
  in 
  pre-glacial 
  as 
  well 
  as 
  in 
  post-glacial 
  time; 
  that 
  pro- 
  

   gressive 
  subsidence 
  is 
  not 
  a 
  general 
  cause. 
  No 
  evidence 
  of 
  Pleis- 
  

   tocene 
  wave-cut 
  platforms 
  was 
  discovered. 
  Although 
  the 
  object 
  

   of 
  Dr. 
  Foye's 
  expedition, 
  made 
  possible 
  by 
  a 
  Sheldon 
  Traveling 
  

   Fellowship, 
  was 
  a 
  study 
  of 
  the 
  geology 
  of 
  coral 
  reefs, 
  the 
  largest 
  

   amount 
  of 
  new 
  material 
  relates 
  to 
  structure 
  and 
  petrography. 
  

   Four 
  periods 
  of 
  volcanism 
  are 
  indicated 
  — 
  the 
  first 
  rhyolitic, 
  the 
  

   second 
  and 
  third 
  andestic, 
  and 
  the 
  fourth 
  basaltic. 
  h. 
  e. 
  g. 
  

  

  3. 
  The 
  Met 
  amorphic 
  Bocks 
  of 
  Adelie 
  Land; 
  by 
  F. 
  L. 
  Still- 
  

   well. 
  Australasian 
  Antarctic 
  Expedition 
  1911-1914, 
  Series 
  A, 
  

   vol. 
  3, 
  part 
  1, 
  section 
  1, 
  1918. 
  Pp. 
  230, 
  14 
  text 
  figs., 
  35 
  pis. 
  

   (including 
  125 
  figs.) 
  — 
  A 
  large 
  collection 
  of 
  metamorphic 
  rocks 
  

   from 
  Cape 
  Denison, 
  Cape 
  Gray 
  Promontory, 
  Aurora 
  Peak, 
  and 
  

   other 
  localities 
  in 
  Adelie 
  Land 
  have 
  been 
  subjected 
  to 
  petro- 
  

   graphic 
  and 
  chemical 
  study. 
  The 
  rocks 
  include 
  phyllite, 
  garnet 
  

   gneiss, 
  garnet-cordierite 
  gneiss 
  and 
  cyanite-biotite 
  gneiss, 
  devel- 
  

   oped 
  from 
  sediments, 
  and 
  a 
  variety 
  of 
  basic 
  and 
  acid 
  metamor- 
  

   phosed 
  gneisses, 
  equivalents 
  of 
  dolorite, 
  aplite, 
  and 
  granite. 
  

   The 
  amphibolite 
  series 
  is 
  well 
  represented. 
  On 
  the 
  basis 
  of 
  the 
  

   collections 
  in 
  hand 
  Dr. 
  Stillwell 
  discusses 
  several 
  interesting 
  prob- 
  

   lems 
  in 
  metamorphic 
  geology 
  to 
  which 
  he 
  makes 
  helpful 
  contri- 
  

   butions. 
  He 
  supports 
  the 
  hypothesis 
  of 
  diffusion 
  to 
  account 
  for 
  

   amphibolites, 
  calls 
  attention 
  to 
  the 
  limitations 
  of 
  chemical 
  cri- 
  

   teria, 
  and 
  clarifies 
  some 
  points 
  in 
  the 
  problem 
  of 
  migration 
  of 
  

   material 
  during 
  metamorphism. 
  The 
  charnockite 
  series, 
  the 
  

   kodurite 
  series 
  and 
  the 
  "infra 
  plutonic 
  zone" 
  hypothesis 
  are 
  

   somewhat 
  fully 
  discussed. 
  The 
  value 
  of 
  Dr. 
  Stillwell's 
  presen- 
  

   tation 
  is 
  much 
  increased 
  by 
  the 
  inclusion 
  of 
  48 
  excellent 
  micro- 
  

   photographs, 
  30 
  reproductions 
  of 
  rock 
  specimens, 
  and 
  47 
  outdoor 
  

   views. 
  H. 
  E. 
  G. 
  

  

  4. 
  The 
  Factors 
  Influencing 
  Gold 
  Deposition 
  in 
  the 
  Bendigo 
  

   Goldfield, 
  Part 
  II 
  ; 
  by 
  F. 
  L. 
  Stillwell. 
  Advisory 
  Council 
  of 
  

   Science 
  and 
  Industry, 
  Bulletin 
  8, 
  1918 
  (Melbourne, 
  Australia). 
  

   Pp. 
  47, 
  14 
  pis. 
  — 
  To 
  meet 
  the 
  demands 
  for 
  increased 
  production 
  

   and 
  to 
  secure 
  co-operation 
  of 
  organizations 
  and 
  individuals 
  con- 
  

   cerned 
  with 
  Australian 
  resources, 
  the 
  Commonwealth 
  Advisory 
  

   Council 
  of 
  Science 
  and 
  Industry 
  was 
  organized. 
  The 
  results 
  of 
  

   the 
  investigations 
  have 
  appeared 
  in 
  nine 
  bulletins 
  dealing 
  with 
  

   problems 
  of 
  stock 
  raising, 
  agriculture, 
  and 
  mineral 
  products. 
  A 
  

   special 
  committee 
  under 
  the 
  chairmanship 
  of 
  Professor 
  Skeats 
  

   I 
  wis 
  iii 
  hand 
  ;i 
  study 
  of 
  the 
  mode 
  of 
  occurrence 
  of 
  gold 
  in 
  quartz 
  

   with 
  the 
  object 
  of 
  cheapening 
  the 
  cost 
  of 
  deep 
  prospecting. 
  As 
  

   part 
  of 
  the 
  program 
  the 
  Bendigo 
  gold 
  field, 
  formerly 
  one 
  of 
  the 
  

  

  