﻿Chemistry 
  and 
  Physics, 
  147 
  

  

  ing 
  to 
  uranyl 
  pyrophosphate, 
  but 
  it 
  was 
  found 
  that 
  the 
  latter 
  

   was 
  decidedly 
  hygroscopic, 
  so 
  that 
  there 
  was 
  a 
  tendency 
  to 
  

   slightly 
  high 
  results. 
  Precipitations 
  with 
  yellow 
  ammonium 
  

   sulphide 
  and 
  attempts 
  to 
  ignite 
  to 
  U 
  3 
  8 
  invariably 
  gave 
  high 
  

   results, 
  and 
  it 
  was 
  found 
  that 
  the 
  ignited 
  residues 
  always 
  con- 
  

   tained 
  sulphate. 
  The 
  method 
  of 
  reducing 
  uranyl 
  sulphate 
  solu- 
  

   tions 
  by* 
  means 
  of 
  zinc 
  and 
  titrating 
  with 
  permanganate 
  was 
  

   found 
  to 
  be 
  very 
  unsatisfactory, 
  since 
  no 
  definite 
  point 
  of 
  reduc- 
  

   tion 
  could 
  be 
  obtained. 
  The 
  most 
  important 
  feature 
  of 
  the 
  

   investigation 
  appears 
  to 
  be 
  the 
  working 
  out 
  of 
  a 
  method 
  of 
  

   separating 
  uranium 
  from 
  some 
  of 
  the 
  other 
  rare 
  elements. 
  It 
  

   was 
  observed 
  by 
  Peligot 
  in 
  1842 
  that 
  uranyl 
  nitrate 
  was 
  readily 
  

   soluble 
  in 
  ether, 
  and 
  upon 
  applying 
  this 
  fact 
  it 
  was 
  found 
  pos- 
  

   sible 
  to 
  make 
  excellent 
  separations 
  of 
  uranium 
  from 
  vanadium, 
  

   molybdenum 
  and 
  tungsten 
  by 
  evaporating 
  the 
  nitric 
  acid 
  solu- 
  

   tions 
  to 
  dryness, 
  moistening 
  with 
  a 
  little 
  nitric 
  acid 
  and 
  extract- 
  

   ing 
  the 
  uranyl 
  nitrate 
  in 
  a 
  Soxhlet 
  apparatus. 
  It 
  was 
  found 
  

   also 
  that 
  glacial 
  acetic 
  acid 
  of 
  over 
  95% 
  mixed 
  with 
  5% 
  by 
  

   volume 
  of 
  nitric 
  acid 
  of 
  1-42 
  specific 
  gravity 
  will 
  extract 
  uranyl 
  

   nitrate 
  accurately 
  without 
  dissolving 
  any 
  V 
  2 
  5 
  . 
  — 
  Jour. 
  Indust. 
  

   Eng. 
  Chem., 
  12, 
  60. 
  h. 
  l. 
  w. 
  

  

  3. 
  Lecture 
  Demonstrations 
  in 
  Physical 
  Chemistry; 
  by 
  

   Henry 
  S. 
  Van 
  Klooster. 
  12mo, 
  pp. 
  192. 
  Easton, 
  Pa., 
  1919 
  

   (The 
  Chemical 
  Publishing 
  Co.). 
  — 
  This 
  book 
  has 
  been 
  prepared 
  

   for 
  the 
  purpose 
  of 
  furnishing 
  suitable 
  lecture 
  experiments 
  for 
  

   the 
  illustration 
  of 
  our 
  present 
  conceptions 
  of 
  physical 
  chemistry. 
  

   The 
  experiments 
  presented 
  have 
  been 
  selected 
  from 
  a 
  wide 
  

   range 
  of 
  text-books 
  and 
  other 
  literature, 
  and 
  frequent 
  useful 
  

   references 
  are 
  given 
  to 
  these 
  sources. 
  

  

  The 
  matter 
  is 
  conveniently 
  divided 
  into 
  twelve 
  chapters 
  deal- 
  

   ing 
  with 
  various 
  topics, 
  such 
  as 
  diffusion, 
  osmosis, 
  catalysis, 
  

   electro-chemistry, 
  colloids, 
  actino-chemistry, 
  etc. 
  The 
  experi- 
  

   ments 
  are 
  very 
  clearly 
  discussed 
  and 
  described 
  and 
  they 
  are 
  

   excellently 
  illustrated 
  by 
  diagrams. 
  

  

  The 
  book 
  appears 
  to 
  be 
  a 
  very 
  satisfactory 
  one 
  for 
  the 
  use 
  of 
  

   lecturers 
  on 
  phyical 
  chemistry, 
  and 
  it 
  should 
  be 
  very 
  useful 
  also 
  

   to 
  lecturers 
  in 
  general 
  chemistry 
  as 
  the 
  source 
  of 
  many 
  sugges- 
  

   tions, 
  h. 
  l. 
  w. 
  

  

  4. 
  The 
  Physical 
  Chemistry 
  of 
  the 
  Metals; 
  by 
  Rudolph 
  

   Schenck. 
  Translated 
  and 
  Annotated 
  by 
  Reginald 
  Scott 
  

   Dean. 
  8vo, 
  pp. 
  239. 
  New 
  York, 
  1919 
  (John 
  Wiley 
  & 
  Sons).— 
  

   This 
  translation 
  appears 
  to 
  be 
  a 
  somewhat 
  belated 
  one, 
  as 
  the 
  

   German 
  author's 
  preface 
  is 
  dated 
  1908. 
  The 
  translator, 
  how- 
  

   ever, 
  has 
  incorporated 
  into 
  the 
  text 
  such 
  additions 
  as 
  have 
  

   seemed 
  necessary 
  and 
  he 
  has 
  revised 
  the 
  numerical 
  data 
  to 
  make 
  

   them 
  agree 
  with 
  the 
  accepted 
  values. 
  He 
  has 
  also 
  changed 
  the 
  

   book 
  from 
  lecture 
  to 
  text-book 
  form. 
  

  

  The 
  book 
  deals 
  with 
  the 
  properties 
  of 
  the 
  metals, 
  metallic 
  

  

  