﻿Chemistry 
  and 
  Physics, 
  217 
  

  

  the 
  recent 
  more 
  accurate 
  determination 
  of 
  the 
  density 
  of 
  mer- 
  

   cury. 
  

  

  Among 
  the 
  new 
  tables 
  added 
  may 
  be 
  mentioned 
  those 
  for 
  

   converting 
  barometric 
  inches 
  and 
  millimeters 
  into 
  millibars, 
  for 
  

   determining 
  heights 
  from 
  pressures 
  expressed 
  in 
  dynamic 
  units, 
  

   tables 
  of 
  gradient 
  winds, 
  and 
  tables 
  giving 
  the 
  duration 
  of 
  

   astronomical 
  and 
  civil 
  twilight, 
  and 
  the 
  transmission 
  percent- 
  

   ages 
  of 
  radiation 
  through 
  moist 
  air. 
  Certain 
  tables, 
  chiefly 
  

   mathematical, 
  have 
  been 
  omitted 
  from 
  the 
  latest 
  edition. 
  It 
  is 
  

   thus 
  evident 
  that 
  the 
  value 
  of 
  this 
  useful 
  book 
  has 
  been 
  greatly 
  

   enhanced 
  by 
  the 
  thorough 
  revision 
  which 
  it 
  has 
  recently 
  received. 
  

  

  h. 
  s. 
  u. 
  

  

  9. 
  Accounts 
  Rendered 
  of 
  Work 
  Done 
  and 
  Things 
  Seen; 
  by 
  

   J. 
  Y. 
  Buchanan. 
  Pp. 
  lvii, 
  435. 
  Cambridge, 
  1919 
  (University 
  

   Press). 
  — 
  This 
  volume 
  is 
  essentially 
  a 
  collection 
  of 
  thirty-three 
  

   papers 
  written 
  by 
  the 
  author 
  at 
  different 
  times 
  and 
  dealing 
  with 
  

   a 
  variety 
  of 
  subjects. 
  In 
  general, 
  however, 
  the 
  field 
  of 
  observa- 
  

   tion 
  is 
  restricted 
  to 
  oceanography, 
  and 
  to 
  such 
  allied 
  lines 
  of 
  

   research 
  as 
  would 
  interest 
  the 
  chief 
  physical-chemist 
  of 
  the 
  

   Challenger 
  expedition. 
  The 
  papers 
  are 
  reproduced 
  in 
  their 
  

   original 
  form, 
  and 
  all 
  notes 
  or 
  comments 
  on 
  the 
  articles 
  them- 
  

   selves, 
  as 
  well 
  as 
  reminiscences 
  regarding 
  the 
  circumstances 
  in 
  

   which 
  they 
  appeared, 
  are 
  embodied 
  in 
  the 
  Contents 
  (pages 
  vii 
  

   to 
  lvii), 
  and 
  occasionally 
  in 
  postscripts 
  to 
  the 
  papers. 
  

  

  Many 
  of 
  the 
  topics 
  are 
  of 
  a 
  sufficiently 
  non-technical 
  nature 
  

   to 
  afford 
  very 
  interesting 
  and 
  instructive 
  material 
  for 
  the 
  gen- 
  

   eral 
  reader. 
  As 
  examples 
  of 
  this 
  type 
  may 
  be 
  mentioned 
  : 
  ' 
  ' 
  The 
  

   Sperm 
  Whale 
  and 
  its 
  Food, 
  The 
  Oceanographical 
  Museum 
  at 
  

   Monaco, 
  The 
  Wreck 
  of 
  the 
  'Santos 
  Dumont 
  No. 
  6' 
  at 
  Monaco*, 
  

   . 
  . 
  ., 
  and 
  The 
  Daintiness 
  of 
  the 
  Eat." 
  The 
  text 
  is 
  profusely 
  

   illustrated 
  with 
  excellent 
  figures 
  and 
  plates, 
  and 
  it 
  forms 
  a 
  

   valuable 
  companion 
  volume 
  to 
  the 
  earlier 
  collection 
  of 
  papers 
  

   by 
  the 
  same 
  author 
  entitled 
  "Comptes 
  Rendus 
  of 
  Observation 
  

   and 
  Reasoning" 
  (see 
  47, 
  139, 
  1919). 
  h. 
  s. 
  u. 
  

  

  10. 
  La 
  Tension 
  de 
  Vapeur 
  des 
  Melanges 
  de 
  Liquides. 
  

   L'Azeotropisme. 
  Part 
  I; 
  by 
  Maurice 
  Lecat. 
  Pp. 
  xii, 
  319. 
  

   Brussels, 
  1918 
  (H. 
  Lamertin). 
  — 
  The 
  primary 
  object 
  of 
  the 
  entire 
  

   work 
  is 
  to 
  present 
  the 
  results 
  already 
  obtained 
  and 
  to 
  facilitate 
  

   the 
  future 
  study 
  of 
  the 
  remarkable 
  physical 
  property 
  called 
  

   " 
  azeotropism, 
  " 
  that 
  is, 
  the 
  phenomenon 
  exhibited 
  by 
  certain 
  

   homogeneous 
  mixtures 
  of 
  two 
  or 
  more 
  liquids 
  which 
  maintain 
  a 
  

   constant 
  boiling 
  point 
  at 
  constant 
  pressure 
  quite 
  independently 
  

   of 
  the 
  percentages 
  of 
  the 
  constituents 
  present 
  in 
  the 
  mixture. 
  

   In 
  general, 
  therefore, 
  azeotropic 
  mixtures 
  are 
  the 
  analogues 
  of 
  

   eutectic 
  solid 
  solutions 
  or 
  alloys. 
  The 
  author 
  characterizes 
  the 
  

   first 
  part 
  (or 
  volume) 
  as 
  a 
  "Handbuch" 
  and 
  the 
  second 
  as 
  a 
  

   "Lehrbuch." 
  

  

  The 
  first 
  quarto 
  volume 
  begins 
  with 
  an 
  elementary 
  review 
  

  

  