﻿486 
  Scientific 
  Intelligence. 
  

  

  ores 
  it 
  is 
  almost 
  invariably 
  obtained 
  by 
  precipitation 
  in 
  the 
  form 
  

   of 
  sodium 
  uranate, 
  Na 
  2 
  U 
  2 
  0.. 
  The 
  process 
  consists 
  in 
  melting 
  at 
  

   a 
  red 
  heat 
  in 
  an 
  iron 
  pot 
  a 
  mixture 
  of 
  20 
  parts 
  of 
  the 
  sodium 
  

   uranate, 
  35 
  parts 
  of 
  common 
  salt 
  and 
  one 
  part 
  of 
  ground 
  charcoal. 
  

   After 
  cooling, 
  the 
  material 
  is 
  treated 
  with 
  water 
  which 
  leaves 
  

   the 
  black 
  oxide 
  in 
  the 
  form 
  of 
  a 
  powder 
  while 
  the 
  salt 
  dissolves, 
  

   together 
  with 
  some 
  sodium 
  vanadate, 
  as 
  the 
  sodium 
  uranate 
  

   obtained 
  from 
  carnotite 
  contains 
  this 
  salt. 
  The 
  vanadium 
  is 
  

   saved 
  by 
  precipitation 
  with 
  iron 
  sulphate. 
  Several 
  tons 
  of 
  the 
  

   uranium 
  oxide 
  have 
  been 
  prepared 
  in 
  this 
  w 
  r 
  ay 
  with 
  the 
  expecta- 
  

   tion 
  that 
  it 
  w 
  7 
  ill 
  be 
  useful 
  in 
  the 
  manufacture 
  of 
  steel. 
  Professor 
  

   Parsons 
  states 
  that 
  there 
  appears 
  to 
  be 
  no 
  doubt 
  that 
  uranium 
  

   steel 
  is 
  being 
  used 
  in 
  Germany 
  in 
  some 
  of 
  the 
  larger 
  cannon, 
  in 
  

   which 
  it 
  is 
  said 
  to 
  give 
  improved 
  rigidity 
  at 
  the 
  high 
  temperatures 
  

   occasioned 
  by 
  rapid 
  firing. 
  Also 
  that 
  uranium 
  has 
  been 
  proposed 
  

   and, 
  indeed, 
  used 
  to 
  replace 
  tungsten 
  in 
  tool 
  steel, 
  in 
  which 
  it 
  is 
  

   claimed 
  that 
  one 
  per 
  cent 
  ef 
  uranium 
  can 
  successfully 
  take 
  the 
  

   place 
  of 
  from 
  6 
  to 
  12 
  per 
  cent 
  of 
  tungsten. 
  — 
  Jour. 
  Indust. 
  and 
  

   £Jng. 
  Chem., 
  ix, 
  456. 
  h. 
  l. 
  w\ 
  

  

  3. 
  Theoretical 
  Chemistry 
  from 
  the 
  Standpoint 
  of 
  Avo 
  c/a 
  dro's 
  

   Rule 
  and 
  Thermodynamics; 
  by 
  Walter 
  Nernst. 
  Fourth 
  

   English 
  Edition, 
  Revised 
  by 
  H. 
  T. 
  Tizard. 
  8vo, 
  pp. 
  853. 
  Lon- 
  

   don, 
  1916 
  (The 
  Macmillan 
  Company, 
  New 
  York). 
  — 
  The 
  first 
  

   edition 
  of 
  this 
  important 
  work 
  on 
  physical 
  chemistry 
  appeared 
  in 
  

   1893. 
  The 
  present 
  English 
  edition 
  is 
  based 
  upon 
  the 
  seventh 
  

   German 
  issue. 
  The 
  translator 
  says 
  that 
  the 
  character 
  of 
  the 
  

   work 
  is 
  slowl} 
  1 
  " 
  changing, 
  since 
  it 
  is 
  no 
  longer 
  possible 
  in 
  a 
  book 
  

   of 
  this 
  size 
  to 
  describe 
  fully 
  all 
  the 
  modern 
  developments 
  of 
  

   theoretical 
  chemistry, 
  and 
  that 
  the 
  new 
  matter 
  in 
  this 
  edition 
  is 
  

   concerned 
  mainly 
  with 
  Dr. 
  Nernst's 
  own 
  researches. 
  These 
  

   inevitable 
  restrictions, 
  however, 
  will 
  detract 
  but 
  little 
  from 
  the 
  

   value 
  of 
  the 
  book. 
  The 
  work 
  is 
  so 
  well 
  known 
  in 
  its 
  many 
  

   editions 
  that 
  no 
  detailed 
  description 
  of 
  it 
  need 
  be 
  given 
  here, 
  but 
  

   it 
  may 
  be 
  stated 
  that 
  the 
  work 
  is 
  very 
  comprehensive 
  in 
  regard 
  

   to 
  theory, 
  and 
  that 
  the 
  treatment 
  of 
  the 
  subject 
  is 
  extremely 
  

   mathematical, 
  so 
  that 
  it 
  is 
  particularly 
  suited 
  for 
  the 
  use 
  of 
  ad- 
  

   vanced 
  students 
  of 
  physical 
  chemistry. 
  h. 
  l. 
  w. 
  

  

  4. 
  A 
  Text 
  Book 
  of 
  Thermochemistry 
  and 
  Thermodynamics; 
  

   by 
  Otto 
  Sackur; 
  Translated 
  and 
  Revised 
  by 
  G. 
  E. 
  Gibsox. 
  

   8vo, 
  pp. 
  439. 
  London, 
  1917 
  (The 
  Macmillan 
  Company, 
  New 
  

   York). 
  — 
  There 
  is 
  no 
  doubt 
  that 
  a 
  thorough 
  understanding 
  of 
  

   thermodynamics 
  is 
  of 
  great 
  importance 
  in 
  the 
  study 
  of 
  physical 
  

   chemistry, 
  and 
  this 
  book 
  gives 
  a 
  very 
  well-arranged 
  and 
  able 
  

   presentation 
  of 
  the 
  subject 
  in 
  connection 
  with 
  thermochemistry. 
  

   The 
  student 
  using 
  it 
  is 
  expected 
  to 
  be 
  a 
  master 
  of 
  the 
  fundamen- 
  

   tal 
  principles 
  of 
  physics 
  and 
  chemistry, 
  and 
  to 
  have 
  some 
  

   knowledge 
  of 
  the 
  differential 
  and 
  integral 
  calculus, 
  but 
  the 
  

   more 
  important 
  chapters 
  of 
  the 
  book 
  will 
  probably 
  be 
  intelligible 
  

   without 
  the 
  mathematical 
  knowledge. 
  It 
  appears 
  that 
  the 
  

   translator 
  has 
  produced 
  a 
  very 
  satisfactory 
  English 
  edition, 
  and 
  

   that 
  he 
  has 
  made 
  some 
  desirable 
  changes 
  and 
  additions 
  in 
  the 
  

   text. 
  h. 
  l. 
  w. 
  

  

  