﻿00, 
  

  

  Scientific 
  Intelligence. 
  

  

  to 
  the 
  precautions 
  necessary 
  in 
  sampling 
  for 
  analysis. 
  The 
  

   ' 
  ' 
  mineral 
  analysis 
  ' 
  ' 
  included 
  in 
  Part 
  I 
  comprises 
  the 
  determina- 
  

   tion 
  of 
  silica, 
  potassium 
  and 
  sodium 
  in 
  silicates, 
  iron 
  aluminum, 
  

   manganese, 
  calcium 
  and 
  magnesium 
  in 
  spathic 
  iron 
  ore, 
  sulphur 
  

   in 
  pyrites, 
  titanium 
  in 
  iron 
  ores, 
  copper 
  by 
  iodimetry 
  and 
  the 
  

   proximate 
  analysis 
  of 
  coals. 
  The 
  "metal 
  analysis" 
  of 
  Part 
  II 
  

   includes 
  the 
  analysis 
  of 
  phosphor-bronze, 
  and 
  besides 
  this 
  only 
  

   the 
  determination 
  in 
  irons 
  or 
  steels 
  of 
  carbon, 
  manganese, 
  

   phosphorus, 
  sulphur, 
  silica, 
  copper, 
  nickel, 
  chromium, 
  tungsten 
  

   and 
  vanadium. 
  The 
  book 
  is 
  supplied 
  with 
  an 
  atomic 
  weight 
  table 
  

   as 
  well 
  as 
  with 
  tables 
  of 
  4-place 
  logarithms 
  and 
  antilogarithms, 
  

   but 
  as 
  no 
  analytical 
  factors 
  appear 
  to 
  be 
  given, 
  it 
  seems 
  that 
  the 
  

   students 
  are 
  expected 
  to 
  calculate 
  these 
  for 
  themselves. 
  

  

  h. 
  l. 
  w. 
  

  

  5. 
  Reduction 
  Methods 
  in 
  Volumetric 
  Analysis; 
  by 
  Edmund 
  

   Knecht 
  and 
  Eva 
  Hibbert. 
  12mo, 
  pp. 
  135. 
  London, 
  1918 
  

   (Longmans, 
  Green 
  & 
  Co., 
  New 
  York. 
  Price 
  $1.75 
  net).— 
  The 
  

   authors 
  of 
  this 
  book 
  introduced 
  the 
  employment 
  of 
  titanous 
  

   chloride 
  in 
  volumetric 
  analysis 
  about 
  16 
  years 
  ago, 
  and 
  applied 
  

   this 
  reagent 
  to 
  a 
  great 
  variety 
  of 
  determinations, 
  including 
  

   important 
  applications 
  to 
  the 
  estimation 
  of 
  many 
  dyestuffs. 
  

   Their 
  results 
  and 
  those 
  of 
  others 
  were 
  described 
  in 
  a 
  monograph 
  

   about 
  eight 
  years 
  ago, 
  while 
  the 
  present 
  book 
  is 
  a 
  new 
  issue 
  of 
  

   that 
  work 
  with 
  an 
  addendum 
  of 
  about 
  26 
  pages 
  describing 
  recent 
  

   applications 
  of 
  the 
  titanous 
  chloride 
  methods. 
  The 
  book 
  is 
  

   worthy 
  of 
  the 
  careful 
  attention 
  of 
  analytical 
  chemists, 
  for 
  the 
  

   methods 
  are 
  well 
  described, 
  and 
  many 
  of 
  them 
  appear 
  to 
  deserve 
  

   more 
  extensive 
  application 
  than 
  they 
  receive 
  at 
  present. 
  

  

  h. 
  l. 
  w. 
  

  

  6. 
  A 
  Handbook 
  of 
  Colloid 
  Chemistry 
  ; 
  by 
  Wolfgang 
  

   Ostwald. 
  Translated 
  by 
  Martin 
  H. 
  Fischer. 
  8vo, 
  pp. 
  284. 
  

   Philadelphia, 
  1918 
  (P. 
  Blakiston's 
  Son 
  & 
  Co. 
  Price 
  $3.50 
  net).— 
  

   This 
  is 
  the 
  second 
  English 
  edition, 
  corresponding 
  to 
  the 
  third 
  

   German 
  one. 
  Numerous 
  notes 
  have 
  been 
  added 
  to 
  the 
  transla- 
  

   tion 
  by 
  Emil 
  Hatschek. 
  This 
  standard 
  work, 
  dealing 
  with 
  a 
  

   branch 
  of 
  chemistry 
  of 
  great 
  importance, 
  is 
  so 
  well 
  known 
  in 
  

   its 
  first 
  edition 
  which 
  appeared 
  about 
  three 
  years 
  ago, 
  that 
  it 
  

   is 
  merely 
  necessary 
  to 
  say 
  here 
  that 
  only 
  a 
  moderate 
  amount 
  of 
  

   matter 
  has 
  been 
  added 
  in 
  the 
  present 
  edition 
  in 
  order 
  to 
  explain 
  

   the 
  recent 
  important 
  advances 
  in 
  the 
  subject. 
  h. 
  l. 
  w. 
  

  

  7. 
  The 
  Genesis 
  of 
  the 
  Law 
  of 
  Error. 
  — 
  In 
  replying 
  to 
  certain 
  

   adverse 
  criticisms 
  by 
  F. 
  Y. 
  Edgeworth 
  of 
  an 
  earlier 
  paper 
  by 
  

   E. 
  A. 
  Sampson 
  the 
  last 
  named 
  writer 
  has 
  presented 
  a 
  point 
  of 
  

   view 
  which 
  will 
  doubtless 
  be 
  illuminating 
  to 
  physicists, 
  even 
  

   if 
  it 
  may 
  not 
  entirely 
  satisfy 
  the 
  exponents 
  of 
  mathematical 
  

   ultrarefinement. 
  The 
  following 
  quotation 
  indicates 
  the 
  part 
  of 
  

   the 
  discussion 
  which 
  seems 
  to 
  be 
  of 
  general 
  interest: 
  " 
  Where 
  

   then 
  does 
  the 
  Law 
  of 
  Error 
  come 
  from, 
  and 
  why 
  does 
  it 
  apply, 
  

  

  