﻿440 
  Scientific 
  Intelligence. 
  

  

  ried 
  out 
  several 
  places 
  beyond 
  those 
  justified 
  by 
  the 
  data, 
  as 
  he 
  

   says 
  in 
  his 
  preface, 
  " 
  . 
  . 
  .as 
  this 
  involved 
  no 
  extra 
  work 
  [using 
  

   six-place 
  logarithms] 
  and 
  is 
  valuable 
  in 
  inculcating 
  accuracy." 
  

   In 
  regard 
  to 
  this 
  point 
  it 
  may 
  be 
  said 
  that 
  the 
  use 
  of 
  more 
  than 
  

   one 
  uncertain 
  figure 
  at 
  the 
  end 
  of 
  a 
  result 
  should 
  usually 
  be 
  

   considered 
  unsatisfactory, 
  if 
  not 
  absurd. 
  

  

  In 
  spite 
  of 
  this 
  criticism 
  and 
  one 
  or 
  two 
  other 
  minor 
  points 
  

   that 
  will 
  not 
  be 
  taken 
  up 
  here, 
  the 
  book 
  in 
  general 
  gives 
  an 
  

   excellent 
  impression. 
  h. 
  l. 
  w. 
  

  

  3. 
  Quantitative 
  Analysis; 
  by 
  Edward 
  G. 
  Mahin. 
  8vo, 
  pp. 
  

   605. 
  New 
  York, 
  1919 
  (McGraw-Hill 
  Book 
  Company, 
  Inc.).— 
  

   This 
  is 
  the 
  second 
  edition, 
  revised 
  and 
  enlarged, 
  of 
  a 
  book 
  which 
  

   first 
  appeared 
  six 
  years 
  ago 
  as 
  one 
  of 
  the 
  "International 
  Chem- 
  

   ical 
  Series" 
  of 
  text-books. 
  

  

  While 
  this 
  book 
  cannot 
  be 
  regarded 
  as 
  a 
  complete 
  reference 
  

   work 
  on 
  quantitative 
  analysis, 
  or 
  any 
  of 
  its 
  special 
  branches, 
  it 
  

   is 
  extensive 
  enough 
  to 
  provide 
  ample 
  practice 
  for 
  students 
  in 
  

   college 
  courses, 
  with 
  a 
  wide 
  degree 
  of 
  latitude 
  in 
  the 
  selection 
  

   of 
  methods. 
  An 
  excellent 
  feature 
  of 
  the 
  book 
  is 
  the 
  attention 
  

   given 
  to 
  the 
  explanation 
  of 
  the 
  scientific 
  principles 
  involved 
  in 
  

   the 
  processes. 
  

  

  The 
  first 
  part 
  of 
  the 
  book, 
  comprising 
  nearly 
  one-half 
  of 
  its 
  

   contents, 
  is 
  devoted 
  to 
  general 
  quantitative 
  analysis, 
  presenting 
  

   the 
  principles 
  of 
  the 
  operations, 
  a 
  course 
  experimental 
  gravimet- 
  

   ric 
  analysis, 
  a 
  chapter 
  on 
  electro-analysis, 
  and 
  a 
  rather 
  elaborate 
  

   treatment 
  of 
  volumetric 
  analysis. 
  The 
  second 
  part 
  deals 
  with 
  

   the 
  analysis 
  of 
  industrial 
  products 
  and 
  raw 
  materials, 
  including 
  

   rocks, 
  fuels, 
  gas 
  mixtures, 
  oils, 
  fats 
  and 
  waxes, 
  boiler 
  waters, 
  

   drinking 
  waters, 
  steels 
  and 
  alloys, 
  fertilizers, 
  dairy 
  products, 
  

   with 
  a 
  chapter 
  on 
  the 
  fire 
  assay 
  for 
  gold 
  and 
  silver. 
  

  

  The 
  author 
  has 
  followed 
  the 
  example 
  of 
  several 
  recent 
  high 
  

   authorities 
  in 
  advocating 
  the 
  use 
  of 
  a 
  long 
  swing 
  of 
  the 
  balance 
  

   in 
  weighing, 
  with 
  the 
  finding 
  of 
  the 
  center 
  of 
  equilibrium 
  each 
  

   time, 
  and 
  with 
  the 
  troublesome 
  observations 
  and 
  calculations 
  

   involved 
  in 
  this 
  process. 
  This 
  is 
  not 
  the 
  proper 
  place 
  to 
  argue 
  

   fully 
  in 
  regard 
  to 
  the 
  relative 
  merits 
  of 
  the 
  long 
  and 
  short 
  swing 
  

   methods 
  of 
  analytical 
  weighing, 
  but 
  it 
  may 
  be 
  stated 
  here 
  that 
  

   other 
  eminent 
  authorities 
  have 
  preferred, 
  and 
  still 
  prefer, 
  the 
  

   use 
  of 
  a 
  very 
  short 
  swing 
  of 
  the 
  pointer 
  and 
  the 
  use 
  of 
  the 
  center 
  

   of 
  the 
  scale 
  as 
  the 
  zero 
  point, 
  while 
  always 
  weighing 
  by 
  differ- 
  

   ence, 
  and 
  it 
  seems 
  unfortunate 
  to 
  the 
  reviewer 
  that 
  the 
  less 
  

   accurate 
  and 
  more 
  cumbersome 
  method 
  by 
  long 
  swings 
  should 
  be 
  

   used 
  by 
  any 
  analytical 
  chemist. 
  

  

  Naturally, 
  in 
  an 
  extensive 
  work 
  like 
  this, 
  other 
  points 
  of 
  detail 
  

   might 
  be 
  criticized 
  in 
  connection 
  with 
  differences 
  of 
  opinion 
  ; 
  

   but 
  it 
  may 
  be 
  stated 
  that 
  the 
  book 
  as 
  a 
  whole 
  gives 
  an 
  excellent 
  

   impression, 
  and 
  that 
  it 
  appears 
  to 
  be 
  a 
  very 
  suitable 
  one 
  for 
  the 
  

   use 
  of 
  students. 
  h. 
  l. 
  w. 
  

  

  