﻿Chemistry 
  and 
  Physics. 
  415 
  

  

  articles 
  contributed 
  in 
  1911 
  by 
  Comstock 
  to 
  "Science 
  Con- 
  

   spectus." 
  The 
  material 
  of 
  Part 
  I, 
  which 
  is 
  presented 
  in 
  an 
  

   extremely 
  elementary 
  manner, 
  has 
  been 
  amplified 
  and 
  brought 
  up 
  

   to 
  date 
  by 
  the 
  original 
  author 
  Part 
  IT, 
  from 
  the 
  pen 
  of 
  Troland, 
  

   is 
  virtually 
  an 
  appendix 
  and 
  it 
  consists 
  of 
  fifty-six 
  sections 
  relat- 
  

   ing 
  to 
  specific 
  problems 
  and 
  details 
  appropriately 
  omitted 
  in 
  the 
  

   rapid 
  survey 
  of 
  the 
  entire 
  field 
  made 
  in 
  Part 
  I. 
  This 
  field 
  covers 
  

   the 
  following 
  subjects: 
  the 
  properties 
  and 
  behavior 
  of 
  atoms 
  and 
  

   molecules 
  ; 
  the 
  nature 
  of 
  heat, 
  Brownian 
  moA^ement, 
  absolute 
  

   zero, 
  etc. 
  ; 
  the 
  electron 
  and 
  its 
  behavior; 
  electrons, 
  chemical 
  

   action, 
  and 
  light; 
  electrons 
  and 
  magnetism 
  ; 
  radio-activity; 
  the 
  

   structure 
  of 
  the 
  atom; 
  atomic 
  numbers, 
  the 
  quantum 
  hypothesis, 
  

   radiation, 
  and 
  .X-rays 
  ; 
  atoms 
  and 
  life. 
  

  

  The 
  material 
  of 
  Part 
  I 
  is 
  presented 
  in 
  such 
  a 
  pleasing 
  style 
  

   that 
  the 
  writer 
  of 
  this 
  notice 
  was 
  constrained 
  to 
  read 
  every 
  sen- 
  

   tence 
  in 
  it. 
  Frequent 
  reference 
  to 
  Part 
  II 
  showed 
  that 
  it 
  has 
  also 
  

   been 
  written 
  with 
  care 
  and 
  that 
  it 
  constitutes 
  an 
  almost 
  indis- 
  

   pensable 
  supplement 
  to 
  the 
  earlier 
  pages, 
  in 
  the 
  sense 
  that 
  it 
  con- 
  

   tains 
  just 
  the 
  right 
  things 
  to 
  help 
  satisfy 
  the 
  desire 
  for 
  more 
  

   information 
  so 
  skilfully 
  excited 
  in 
  Part 
  I. 
  The 
  fall-page 
  plates 
  

   are 
  unusually 
  good 
  and 
  no 
  pains 
  seem 
  to 
  have 
  been 
  spared 
  by 
  

   both 
  authors 
  and 
  publishers 
  to 
  make 
  the 
  volume 
  as 
  attractive 
  as 
  

   possible. 
  h. 
  s. 
  u. 
  

  

  8. 
  Electric 
  and 
  Magnetic 
  Measurements 
  • 
  by 
  Charles 
  Mar- 
  

   quis 
  Smith. 
  Pp. 
  xii, 
  373, 
  with 
  171 
  figures. 
  New 
  York, 
  1917 
  

   (The 
  Macmillan 
  Co.). 
  — 
  The 
  degree 
  of 
  advancement 
  of 
  this 
  text 
  

   may 
  be 
  inferred 
  from 
  the 
  facts 
  that 
  the 
  equivalent 
  of 
  one 
  year 
  of 
  

   general 
  physics 
  and 
  some 
  knowledge 
  of 
  the 
  calculus 
  are 
  presup- 
  

   posed. 
  Although 
  the 
  ground 
  covered 
  by 
  the 
  fifty-six 
  laboratory 
  

   exercises 
  does 
  not 
  seem 
  to 
  afford 
  anything 
  especially 
  novel, 
  never- 
  

   theless 
  the 
  book 
  possesses 
  several 
  valuable 
  features. 
  For 
  illustra- 
  

   tion, 
  much 
  space 
  is 
  devoted 
  to 
  the 
  general 
  theory 
  upon 
  which 
  the 
  

   experiments 
  are 
  based, 
  special 
  attention 
  being 
  paid 
  to 
  definitions 
  

   and 
  to 
  the 
  precision 
  of 
  measurements. 
  In 
  other 
  words, 
  the 
  text 
  

   has 
  been 
  evolved 
  from 
  a 
  course 
  of 
  lectures 
  as 
  well 
  as 
  from 
  labora- 
  

   tory 
  notes. 
  Another 
  salient 
  feature 
  is 
  that 
  most 
  of 
  the 
  experi- 
  

   ments 
  are 
  described 
  in 
  such 
  a 
  way 
  as 
  not 
  to 
  require 
  particular 
  

   types 
  of 
  apparatus. 
  The 
  exceptional 
  cases 
  involve 
  apparatus 
  

   which 
  is 
  well 
  known 
  and 
  generally 
  available. 
  A 
  few 
  theoreti- 
  

   cal 
  problems, 
  for 
  solution 
  by 
  the 
  student, 
  are 
  given 
  at 
  the 
  ends 
  of 
  

   the 
  earlier 
  chapters. 
  The 
  index 
  is 
  preceded 
  by 
  an 
  appendix 
  which 
  

   contains 
  an 
  outline 
  of 
  the 
  absolute 
  measurement 
  of 
  current 
  and 
  

   of 
  resistance, 
  a 
  table 
  of 
  constants, 
  and 
  a 
  list 
  of 
  standard 
  reference 
  

   books. 
  Because 
  of 
  the 
  clearness 
  and 
  generality 
  of 
  the 
  explana- 
  

   tions 
  the 
  volume 
  merits 
  the 
  serious 
  attention 
  of 
  all 
  who 
  are 
  

   engaged 
  in 
  conducting 
  laboratory 
  courses 
  in 
  pure 
  as 
  well 
  as 
  

   in 
  applied 
  physics. 
  h. 
  s. 
  u. 
  

  

  9. 
  Recreations 
  in 
  Mathematics 
  ; 
  by 
  H. 
  E. 
  Licks. 
  Pp. 
  v, 
  155. 
  

   New 
  York, 
  1917 
  (D. 
  Van 
  Nostrand 
  Co.).— 
  " 
  The 
  object 
  of 
  this 
  

   book 
  is 
  to 
  afford 
  recreation 
  for 
  an 
  idle 
  hour 
  and 
  to 
  excite 
  the 
  

  

  