﻿Geology 
  and 
  Mineralogy. 
  229 
  

  

  ■description 
  is 
  accompanied 
  by 
  several 
  analyses 
  which 
  add 
  greatly 
  

   to 
  the 
  value 
  of 
  the 
  work. 
  l. 
  v. 
  p. 
  

  

  6. 
  JRepertorium 
  der 
  miner 
  cdogischen 
  mid 
  Jcrystcdlographischen 
  

   Literatur 
  vom 
  d. 
  J. 
  Anfang 
  1891, 
  bis 
  Anfang 
  d. 
  J., 
  1897, 
  und 
  

   General-register 
  der 
  Zeitsehrift 
  fur 
  Krystallographie 
  und 
  Miner- 
  

   alogie, 
  Band 
  JOTZ-ATAT-X. 
  Herausgegeben 
  und 
  bearbeitet 
  von 
  

   E. 
  Weixschenk 
  und 
  F. 
  Grtjnling. 
  I 
  Theil. 
  Repertorium 
  von 
  

   E. 
  Weinschenk; 
  pp. 
  354. 
  Leipzig, 
  1899 
  (Wilhelm 
  Engelruann). 
  

   — 
  The 
  appearance 
  of 
  the 
  first 
  part 
  of 
  the 
  third 
  general 
  index 
  

   (vols, 
  xxi 
  to 
  xxx) 
  to 
  Groth's 
  Zeitsehrift 
  brings 
  before 
  the 
  mind 
  

   the 
  long 
  series 
  of 
  volumes, 
  thirty 
  and 
  more, 
  which 
  mineralogists 
  

   owe 
  to 
  the 
  indefatigable 
  labors 
  of 
  the 
  able 
  editor 
  since 
  the 
  enter- 
  

   prise 
  was 
  inaugurated 
  in 
  1877. 
  This 
  has 
  been 
  a 
  period 
  of 
  great 
  

   activity 
  and 
  important 
  advance 
  in 
  mineralogy 
  and 
  to 
  this 
  end 
  the 
  

   Zeitsehrift 
  filr 
  Krystallographie 
  has 
  contributed 
  a 
  large 
  part. 
  

   The 
  fact 
  that 
  it 
  has 
  given 
  from 
  the 
  beginning 
  a 
  remarkably 
  com- 
  

   plete 
  summary 
  of 
  all 
  mineralogical 
  literature 
  makes 
  this 
  Reper- 
  

   torium 
  by 
  Dr. 
  Weinschenk 
  of 
  great 
  value. 
  The 
  second 
  part 
  is 
  

   promised 
  soon. 
  

  

  7. 
  Handbueh 
  der 
  Miner 
  alo 
  g 
  ie 
  ; 
  von 
  Dr. 
  Carl 
  Hintze. 
  Erster 
  

   Band. 
  Elemente, 
  Sulfide, 
  Oxyde, 
  Hcdoide, 
  Carbonate, 
  Sulfate, 
  

   Borate, 
  Phosphate. 
  Yierte 
  Lieferung 
  ; 
  pp. 
  481-640. 
  Leipzig, 
  

   1900 
  (Veit 
  & 
  Comp.). 
  — 
  All 
  mineralogists 
  will 
  welcome 
  another 
  

   part 
  of 
  Hintze's 
  Mineralogie, 
  which 
  forms 
  the 
  sixteenth 
  Lieferung 
  

   thus 
  far 
  published. 
  It 
  is 
  devoted 
  to 
  the 
  simple 
  sulphides, 
  the 
  

   species 
  of 
  galena, 
  chalcocite 
  and 
  S23halerite 
  being 
  discussed 
  with 
  

   especial 
  fulness. 
  

  

  8. 
  Tabellen 
  zur 
  mikroskopisehen 
  Bestimmung 
  der 
  Miner 
  alien 
  

   nach 
  ihrem 
  Brechungsindex 
  / 
  von 
  Dr. 
  J. 
  L. 
  C. 
  Schroeder 
  van" 
  

   der 
  Kolk; 
  pp. 
  48. 
  Wiesbaden, 
  1900 
  (C. 
  W. 
  Kreidel).— 
  This 
  

   paper 
  has 
  been 
  republished 
  from 
  the 
  pages 
  of 
  the 
  Zeitsehrift 
  fur 
  

   analytische 
  Chemie. 
  It 
  consists 
  chiefly 
  of 
  mineralogical 
  tables 
  in 
  

   which 
  the 
  species 
  are 
  arranged 
  according 
  to 
  their 
  refractive 
  in- 
  

   dices, 
  the 
  first 
  and 
  longest 
  table 
  being 
  divided 
  into 
  two 
  parts, 
  of 
  

   which 
  the 
  first 
  includes 
  species 
  with 
  indices 
  from 
  1*34 
  to 
  1*83: 
  

   the 
  second 
  those 
  with 
  indices 
  higher 
  than 
  1*83. 
  Those 
  between 
  

   1*83 
  and 
  1*93 
  are 
  further 
  subdivided, 
  as 
  isotropic, 
  uniaxial, 
  and 
  

   biaxial. 
  In 
  each 
  case, 
  after 
  the 
  name 
  of 
  a 
  species, 
  a 
  brief 
  state- 
  

   ment 
  is 
  made 
  in 
  regard 
  to 
  its 
  composition 
  and 
  prominent 
  physical 
  

   and 
  chemical 
  characters. 
  A 
  supplementary 
  table 
  gives 
  the 
  min- 
  

   erals 
  arranged 
  according 
  to 
  Groth's 
  Tabellarische 
  Uebersicht, 
  

   with 
  indices 
  added. 
  The 
  introductory 
  portion 
  discusses 
  the 
  

   author's 
  method 
  of 
  obtaining 
  the 
  approximate 
  values 
  of 
  the 
  

   indices 
  of 
  a 
  given 
  crystal 
  or 
  crystal 
  fragment 
  by 
  immersing 
  it 
  

   successively 
  in 
  various 
  solutions 
  whose 
  refractive 
  power 
  is 
  known 
  

   and 
  noting 
  whether 
  its 
  outline 
  is 
  marked, 
  because 
  of 
  total 
  reflec- 
  

   tion, 
  by 
  a 
  more 
  or 
  less 
  prominent 
  dark 
  (or 
  colored) 
  border 
  until 
  

   this 
  finally 
  disappears, 
  when 
  the 
  indices 
  of 
  crystal 
  and 
  solution 
  

   correspond. 
  

  

  