﻿Chemistry 
  and 
  Physics. 
  649 
  

  

  work 
  is 
  therefore 
  not 
  intended 
  for 
  technical 
  students 
  or 
  practical 
  

   wireless 
  telegraphists, 
  .... 
  but 
  is 
  put 
  forward 
  (with 
  diffidence) 
  

   as 
  a 
  little 
  attempt 
  to 
  furnish 
  the 
  general 
  reader 
  with 
  a 
  fairly 
  non- 
  

   technical 
  account 
  of 
  the 
  underlying 
  principles 
  and 
  practical 
  

   achievements 
  of 
  wireless 
  telegraphy, 
  and 
  of 
  the 
  wonders 
  which 
  it 
  

   has 
  rendered 
  possible 
  in 
  the 
  transmission 
  of 
  intelligence." 
  The 
  

   first 
  chapter 
  deals 
  with 
  the 
  luminiferous 
  ether, 
  electricity 
  and 
  

   electrons, 
  and 
  the 
  second 
  with 
  electric 
  oscillations 
  and 
  electric 
  

   waves. 
  Since 
  there 
  are 
  six 
  chapters 
  in 
  all, 
  it 
  is 
  thus 
  seen 
  that 
  

   every 
  precaution 
  has 
  been 
  taken 
  to 
  prepare 
  the 
  reader 
  for 
  a 
  full 
  

   understanding 
  of 
  the 
  four 
  chapters 
  which 
  relate 
  directly 
  to 
  wire- 
  

   less 
  telegraphy 
  and 
  telephony. 
  The 
  text 
  is 
  up 
  to 
  date 
  and 
  trust- 
  

   worthy, 
  the 
  historical 
  side 
  of 
  the 
  subject 
  is 
  presented 
  in 
  a 
  

   complete 
  and 
  fascinating 
  manner, 
  and 
  it 
  seems 
  difficult 
  to 
  imagine 
  

   a 
  better 
  book 
  for 
  the 
  non-mathematical 
  reader. 
  h. 
  s. 
  u. 
  

  

  12. 
  The 
  Principles 
  and 
  Methods 
  of 
  Geometriccd 
  Optics, 
  Second 
  

   Edition; 
  by 
  James 
  P. 
  C. 
  Southall. 
  Pp. 
  xxiv, 
  663, 
  with 
  175 
  

   figures. 
  New 
  York, 
  1913 
  (The 
  Macmillan 
  Co.). 
  — 
  For 
  a 
  review 
  of 
  

   the 
  first 
  edition 
  of 
  this 
  standard 
  work 
  see 
  this 
  Journal, 
  vol. 
  xxxi, 
  

   p. 
  233 
  (1911). 
  The 
  modifications 
  which 
  the 
  earlier 
  edition 
  has 
  

   undergone 
  may 
  be 
  briefly 
  stated 
  as 
  follows 
  : 
  P. 
  viii 
  a, 
  a 
  list 
  of 
  

   recent 
  books 
  on 
  optics 
  is 
  given. 
  Art. 
  15, 
  on 
  "Character 
  of 
  a 
  

   Bundle 
  of 
  Optical 
  Rays", 
  has 
  been 
  rewritten. 
  §51, 
  supple- 
  

   mented 
  by 
  p. 
  50d. 
  § 
  102, 
  on 
  "Deviation 
  (I)) 
  of 
  Ray 
  Obliquely 
  

   Refracted 
  through 
  a 
  Prism", 
  rewritten. 
  Chapter 
  X 
  has 
  § 
  229a 
  

   added. 
  It 
  is 
  headed 
  " 
  Trigonometric 
  Formulae 
  of 
  M. 
  Lange 
  for 
  

   Calculating 
  the 
  Path 
  of 
  an 
  Oblique 
  Ray 
  through 
  a 
  Centered 
  Sys- 
  

   tem 
  of 
  Spherical 
  Refracting 
  Surfaces 
  ". 
  An 
  appendix 
  of 
  15 
  pages 
  

   has 
  been 
  added 
  to 
  chapter 
  XL 
  The 
  next 
  chapter 
  has 
  been 
  aug- 
  

   mented 
  by 
  § 
  326a 
  and 
  by 
  an 
  11-page 
  "Note 
  on 
  the 
  Calculation 
  

   of 
  the 
  Spherical 
  Errors 
  of 
  an 
  Optical 
  System 
  of 
  Centered 
  Lenses, 
  

   by 
  Means 
  of 
  the 
  Seidel 
  Formulae". 
  Pages 
  612a 
  and 
  612b 
  com- 
  

   prise 
  a 
  list 
  of 
  new 
  letters 
  and 
  symbols. 
  The 
  volume 
  ends 
  with 
  a 
  

   supplementary 
  index. 
  It 
  is 
  therefore 
  evident 
  that 
  the 
  author 
  and 
  

   publishers 
  are 
  sparing 
  no 
  pains 
  to 
  make 
  the 
  book 
  converge 
  

   towards 
  practical 
  perfection 
  as 
  rapidly 
  as 
  possible. 
  h. 
  s. 
  it. 
  

  

  13. 
  Physical 
  Measurements; 
  by 
  A. 
  Wilmer 
  Duff 
  and 
  Arthur 
  

   W. 
  Eweix. 
  Third 
  edition. 
  Pp. 
  xii, 
  244, 
  with 
  80 
  figures. 
  Phila- 
  

   delphia, 
  1913 
  (P. 
  Blakiston's 
  Son 
  & 
  Co.). 
  — 
  For 
  earlier 
  notices 
  of 
  

   this 
  excellent 
  book 
  see 
  this 
  Journal, 
  vol. 
  xxvii, 
  p. 
  488 
  (1909) 
  and 
  

   vol. 
  xxx, 
  p. 
  350 
  (1910). 
  "With 
  the 
  exception 
  of 
  the 
  introduc- 
  

   tion 
  of 
  a 
  second 
  method 
  for 
  the 
  measurement 
  of 
  viscosity, 
  no 
  

   considerable 
  changes 
  will 
  be 
  found 
  in 
  this 
  edition 
  ; 
  but 
  numerous 
  

   minor 
  improvements 
  have 
  been 
  made 
  in 
  the 
  descriptions 
  of 
  appa- 
  

   ratus 
  and 
  methods 
  ". 
  ■ 
  h. 
  s. 
  u. 
  

  

  14. 
  Uber 
  kausale 
  und 
  konditionale 
  Weltanschauung 
  and 
  deren 
  

   Stellung 
  zur 
  Enticicklungsmechanik 
  ; 
  by 
  Wilhelm 
  Roux. 
  Pp. 
  

   66. 
  Leipzig, 
  1913 
  (Wilhelm 
  Engelmann). 
  — 
  In 
  this 
  critical 
  essay 
  

   the 
  author 
  adduces 
  a 
  very 
  great 
  number 
  of 
  arguments 
  to 
  show 
  

   that 
  the 
  " 
  Konciitionismus 
  " 
  of 
  Max 
  Yerworn 
  is 
  utterly 
  worthless. 
  

   "Statt 
  der 
  angekiindigten, 
  neue 
  Erkenntnis 
  bringenden 
  Weltans- 
  

  

  