﻿Chemistry 
  and 
  Physics. 
  135 
  

  

  a 
  current 
  of 
  air 
  at 
  a 
  uniform 
  rate 
  through 
  a 
  definite 
  volume 
  of 
  

   thorium 
  solution 
  and 
  then 
  through 
  the 
  ionization 
  chamber 
  and 
  

   comparing 
  the 
  effects 
  of 
  known 
  amounts 
  of 
  thorium 
  upon 
  the 
  

   electroscope 
  with 
  the 
  effects 
  of 
  the 
  thorium 
  in 
  the 
  samples 
  to 
  be 
  

   analyzed. 
  For 
  details 
  of 
  the 
  apparatus 
  and 
  the 
  precautions 
  

   necessary 
  for 
  preparing 
  " 
  radiochemically 
  complete" 
  solutions 
  

   of 
  monazite 
  the 
  original 
  article 
  must 
  be 
  referred 
  to, 
  but 
  it 
  is 
  

   stated 
  that 
  an 
  accuracy 
  within 
  1-5 
  per 
  cent 
  of 
  the 
  total 
  thorium 
  

   is 
  attainable 
  by 
  this 
  method, 
  and 
  hence 
  it 
  appears 
  to 
  be 
  a 
  prac- 
  

   tically 
  useful 
  process. 
  Jour. 
  Amer. 
  Chem. 
  Soc, 
  41, 
  42. 
  

  

  H. 
  L. 
  W. 
  

  

  3. 
  Coal 
  and 
  its 
  Scientific 
  Uses; 
  by 
  William 
  A. 
  Bone. 
  8vo, 
  

   pp. 
  491. 
  London, 
  1918 
  (Longmans, 
  Green 
  and 
  Co., 
  Fourth 
  

   Ave. 
  and 
  30th 
  St., 
  N. 
  Y. 
  Price 
  $7 
  net).— 
  This 
  is 
  one 
  of 
  the 
  

   extensive 
  and 
  valuable 
  series 
  of 
  "Monographs 
  on 
  Industrial 
  

   Chemistry," 
  edited 
  by 
  Sir 
  Edward 
  Thorpe. 
  It 
  is 
  a 
  very 
  able 
  

   and 
  interesting 
  treatise 
  on 
  coal, 
  and 
  deals 
  with 
  statistics 
  showing 
  

   its 
  importance, 
  with 
  its 
  origin, 
  quite 
  elaborately 
  with 
  its 
  chem- 
  

   ical 
  composition, 
  with 
  its 
  combustion 
  including 
  its 
  application 
  

   to 
  domestic 
  heating, 
  with 
  the 
  smoke 
  nuisance, 
  with 
  the 
  produc- 
  

   tion 
  of 
  coke 
  and 
  gases 
  from 
  it, 
  with 
  fuel-economy 
  in 
  connection 
  

   with 
  iron 
  and 
  steel 
  manufacture, 
  with 
  power 
  production 
  from 
  

   coal, 
  and 
  with 
  surface 
  combustion. 
  As 
  Professor 
  Bone 
  is 
  one 
  

   of 
  the 
  inventors 
  of 
  the 
  remarkable 
  and 
  practically 
  important 
  

   application 
  of 
  surface 
  combustion, 
  his 
  discussion 
  of 
  it 
  is 
  partic- 
  

   ularly 
  interesting. 
  

  

  The 
  book 
  is 
  profusely 
  supplied 
  with 
  useful 
  tables, 
  diagrams 
  

   and 
  figures, 
  and 
  it 
  contains 
  also 
  a 
  number 
  of 
  excellent 
  plates, 
  

   from 
  photographs, 
  representing 
  manufacturing 
  apparatus. 
  It 
  

   can 
  be 
  recommended 
  to 
  all 
  who 
  are 
  interested 
  in 
  the 
  scientific 
  

   aspects 
  of 
  this 
  vastly 
  important 
  practical 
  subject. 
  h. 
  l. 
  w. 
  

  

  4. 
  The 
  Applications 
  of 
  Electrolysis 
  in 
  Chemical 
  Industry; 
  by 
  

   Arthur 
  J. 
  Hale. 
  8vo, 
  pp. 
  148. 
  London, 
  1918 
  (Longmans, 
  

   Green 
  and 
  Co. 
  Price 
  $2.50 
  net). 
  — 
  This 
  book 
  is 
  another 
  of 
  the 
  

   very 
  important 
  series 
  of 
  "Monographs 
  on 
  Industrial 
  Chemistry," 
  

   edited 
  by 
  Sir 
  Edward 
  Thorpe. 
  It 
  begins 
  with 
  an 
  introduction 
  

   dealing 
  with 
  the 
  theories 
  connected 
  with 
  electrolysis, 
  and 
  then 
  

   the 
  methods 
  of 
  generating 
  the 
  current 
  are 
  described. 
  After 
  

   that 
  the 
  important 
  applications 
  are 
  discussed, 
  including 
  the 
  

   refining 
  and 
  winning 
  of 
  metals, 
  the 
  production 
  of 
  hydrogen, 
  

   oxygen, 
  chlorine, 
  caustic 
  soda, 
  hypochlorites, 
  chlorates, 
  per- 
  

   chlorates, 
  and 
  many 
  other 
  compounds. 
  

  

  The 
  book 
  is 
  provided 
  with 
  numerous 
  illustrations, 
  it 
  gives 
  

   many 
  references 
  to 
  the 
  literature, 
  and 
  it 
  gives 
  an 
  excellent 
  

   account 
  of 
  these" 
  very 
  important 
  industries, 
  so 
  that 
  it 
  is 
  an 
  

   unusually 
  interesting 
  and 
  useful 
  book. 
  h. 
  l. 
  w. 
  

  

  5. 
  Introduction 
  to 
  Organic 
  Chemistry; 
  by 
  John 
  Tappan 
  

   Stoddard. 
  12mo, 
  pp. 
  423. 
  Philadelphia, 
  1918 
  (P. 
  Blakis- 
  

   ton's 
  Son 
  & 
  Co.). 
  — 
  This 
  text-book 
  which 
  has 
  been 
  extensively 
  

  

  