﻿468 
  Scientific 
  Intelligence. 
  

  

  mersum, 
  Platydema 
  violacea, 
  and 
  Trapa 
  natans, 
  together 
  with 
  

   the 
  southerly 
  retreat 
  of 
  other 
  plants, 
  indicate 
  a 
  distinctly 
  warmer 
  

   climate 
  for 
  the 
  \)0'>i-Litorina 
  oak 
  period 
  following 
  the 
  pine 
  flora. 
  

   The 
  decline 
  of 
  the 
  oak 
  period 
  is 
  supposed 
  to 
  liave 
  been 
  coeval 
  

   with 
  early 
  man, 
  the 
  present 
  being 
  marked 
  by 
  fir 
  forests 
  in 
  the 
  

   south, 
  and 
  pine 
  in 
  the 
  north. 
  G. 
  r. 
  w. 
  

  

  8. 
  La 
  Gkologie 
  experimentale 
  ; 
  par 
  Stanilas 
  Meunier. 
  8°, 
  

   pp. 
  311. 
  Paris, 
  1899 
  (F. 
  Alcan). 
  — 
  In 
  this 
  work 
  the 
  author 
  has 
  

   discussed 
  in 
  a 
  popular 
  manner 
  a 
  number 
  of 
  common 
  geological 
  

   phenomena 
  as 
  well 
  as 
  some 
  of 
  those 
  more 
  abstruse, 
  and 
  gives 
  the 
  

   details 
  of 
  rather 
  simple 
  experiments 
  by 
  which 
  these 
  may 
  be 
  

   imitated 
  and 
  in 
  many 
  cases 
  explained. 
  The 
  work 
  is 
  illustrated 
  

   by 
  cuts 
  of 
  apparatus. 
  The 
  teacher 
  of 
  geology 
  will 
  find 
  it 
  to 
  con- 
  

   tain 
  many 
  suggestive 
  hints. 
  l. 
  v. 
  p. 
  

  

  9. 
  Brief 
  notices 
  of 
  some 
  recently 
  described 
  minerals. 
  — 
  A 
  paper 
  

   by 
  the 
  late 
  Prof. 
  Arzrnni 
  and 
  K. 
  Thaddeeff, 
  completed 
  and 
  edited 
  

   by 
  A. 
  Dannenberg 
  (Zeitschr. 
  f. 
  Kryst., 
  xxxi, 
  229) 
  contains 
  

   descriptions 
  of 
  the 
  following 
  three 
  new 
  species 
  from 
  Chili. 
  

  

  Arzrunite 
  occurs 
  in 
  drusy 
  crystalline 
  crusts 
  and 
  rarely 
  in 
  dis- 
  

   tinct 
  small 
  prismatic 
  crystals. 
  These 
  are 
  hexagonal 
  in 
  aspect 
  but 
  

   are 
  shown 
  optically 
  to 
  belong 
  to 
  the 
  orthorhombic 
  system 
  ; 
  the 
  

   prismatic 
  angle 
  varies 
  but 
  little 
  from 
  60°. 
  The 
  color 
  is 
  blue 
  or 
  

   bluish 
  green 
  with 
  strong 
  pleochroism. 
  Two 
  analyses 
  by 
  Thad- 
  

   deeff, 
  both 
  on 
  very 
  small 
  quantities, 
  gave 
  the 
  following 
  results 
  : 
  

   SO3 
  CI 
  PbO 
  CuO 
  SiOa 
  FesOg 
  CaO 
  ZnO 
  H2O 
  

  

  1. 
  8-07 
  14-39 
  31-41 
  21-39 
  13-60 
  0-70 
  1-70 
  undet. 
  uadet. 
  

  

  2. 
  13-06 
  946 
  33-38 
  14-54 
  8-88 
  1-81 
  1-87 
  4-08 
  ll-0l 
  = 
  98'09 
  

  

  These 
  analyses 
  vary 
  widely, 
  but 
  by 
  assuming 
  the 
  presence 
  of 
  

   various 
  impurities, 
  namely, 
  quartz 
  (SiOJ, 
  limonite 
  (2Fe203 
  . 
  

   3H,0), 
  gypsum 
  (CaS0, 
  + 
  2H,0) 
  and 
  goslafite 
  (ZnS0, 
  + 
  7H,0), 
  a 
  

   ratio 
  is 
  obtained 
  for 
  the 
  pure 
  mineral 
  corresponding 
  to 
  a 
  double 
  

   salt 
  of 
  basic 
  lead 
  sulphate 
  and 
  basic 
  copper 
  chloride. 
  The 
  

   final 
  formula 
  obtained 
  is 
  PbO.PbSO^ 
  + 
  3(CuCl.Hp) 
  +Cu(OH),. 
  

   The 
  exact 
  locality 
  is 
  in 
  the 
  mine 
  Buena 
  Esperanza, 
  ChallacoUo, 
  

   Tarapaca, 
  Chili. 
  

  

  Stelznerite 
  occurs 
  in 
  loose 
  crystalline 
  masses 
  and, 
  implanted 
  

   upon 
  them, 
  in 
  fine 
  green 
  transparent 
  prismatic 
  crystals. 
  These 
  

   resemble 
  brochantite 
  closely, 
  to 
  which 
  species 
  the 
  new 
  mineral 
  is 
  

   allied 
  chemically. 
  The 
  crystals 
  belong 
  to 
  the 
  orthorhombic 
  sys- 
  

   tem, 
  the 
  prismatic 
  angle 
  beini^ 
  53° 
  28'. 
  The 
  specific 
  gravity 
  is 
  

   3*884. 
  An 
  analysis 
  gave 
  Thaddeeff: 
  

  

  SO3 
  CuO 
  H2O 
  FesOg 
  CaO 
  insol. 
  

  

  22-40 
  6708 
  1022 
  0-34 
  006 
  0-44 
  100-54 
  

  

  For 
  this 
  the 
  formula 
  calculated 
  is 
  CuS0,.2Cu(0H)„. 
  The 
  locality 
  

   is 
  Remolinos, 
  Vallinar, 
  Chili. 
  

  

  Kafa>jlite 
  forms 
  a 
  crystalline 
  incrustation 
  on 
  galena, 
  quartz 
  

   and 
  celestite. 
  The 
  crystal 
  needles 
  are 
  transparent 
  aiui 
  of 
  a 
  violet- 
  

   red 
  color 
  and 
  metallic-adamantine 
  luster. 
  They 
  belong 
  to 
  the 
  

   monoclinic 
  system 
  and 
  show 
  considerable 
  complexity 
  of 
  form, 
  

  

  