﻿Chemistry 
  and 
  Physics. 
  147 
  

  

  University. 
  8vo, 
  pp. 
  xiv, 
  347. 
  New 
  York, 
  1899. 
  (The 
  Mac- 
  

   millan 
  Company.) 
  — 
  The 
  starting 
  point 
  of 
  this 
  book, 
  as 
  the 
  author 
  

   tells 
  us 
  in 
  his 
  preface, 
  is 
  the 
  essential 
  unity 
  of 
  the 
  Science 
  of 
  

   Physics. 
  Being 
  the 
  science 
  of 
  matter 
  and 
  energy, 
  its 
  various 
  

   subdivisions 
  should 
  obviously 
  be 
  so 
  presented 
  that 
  the 
  student 
  

   passes 
  by 
  easy 
  and 
  natural 
  steps 
  from 
  one 
  to 
  another, 
  recogniz- 
  

   ing 
  continually 
  the 
  great 
  fact 
  that 
  while 
  energy 
  is 
  conserved, 
  it 
  

   appears 
  in 
  various 
  lorms 
  and 
  gives 
  rise 
  to 
  various 
  phenomena. 
  

   An 
  examination 
  of 
  the 
  book 
  seems 
  to 
  show 
  a 
  good 
  measure 
  of 
  

   success 
  in 
  this 
  direction. 
  The 
  plan 
  is 
  excellent 
  and 
  quite 
  novel 
  

   for 
  an 
  elementary 
  manual. 
  The 
  classification 
  is 
  good, 
  the 
  treat- 
  

   ment 
  of 
  the 
  subject 
  is 
  clear 
  and 
  exact, 
  the 
  illustrations 
  are 
  fresh 
  

   and 
  well 
  selected. 
  We 
  think 
  that 
  Dr. 
  Crew 
  has 
  produced 
  a 
  text- 
  

   book 
  which 
  will 
  not 
  only 
  render 
  a 
  service 
  to 
  the 
  grade 
  of 
  schools 
  

   for 
  which 
  it 
  was 
  written, 
  but 
  will 
  find 
  a 
  place 
  in 
  other 
  and 
  higher 
  

   institutions. 
  g. 
  f. 
  b. 
  

  

  8. 
  Jlodes 
  Operatoires 
  des 
  Essais 
  da 
  Commerce 
  et 
  de 
  V 
  Indus- 
  

   trie. 
  Lecons 
  pratiques 
  d'analyse 
  chimique 
  faites 
  aux 
  Labora- 
  

   toires 
  Bourbouze. 
  Par 
  L. 
  Cuniasse 
  et 
  K. 
  Zwilling, 
  Chimistes- 
  

   Experts 
  de 
  la 
  Ville 
  de 
  Paris. 
  Avec 
  preface 
  de 
  M. 
  Ch. 
  Girard, 
  

   Directeur 
  du 
  Laboratoire 
  Municipal. 
  12mo, 
  pp. 
  viii, 
  302, 
  Paris, 
  

   1900. 
  (Georges 
  Carre 
  et 
  C. 
  Naud). 
  — 
  An 
  analytical 
  manual 
  of 
  

   commercial 
  chemical 
  analysis, 
  giving 
  the 
  methods 
  followed 
  in 
  the 
  

   Bourbouze 
  laboratory 
  of 
  the 
  City 
  of 
  Paris. 
  It 
  is 
  divided 
  into 
  

   two 
  parts, 
  the 
  first 
  treating 
  of 
  mineral 
  analysis, 
  the 
  second 
  of 
  the 
  

   analysis 
  of 
  organic 
  substances. 
  The 
  methods 
  seem 
  to 
  be 
  well 
  

   selected 
  and 
  clearly 
  described. 
  And 
  the 
  range 
  of 
  subjects 
  

   treated 
  is 
  very 
  considerable 
  in 
  view 
  of 
  the 
  size 
  of 
  the 
  volume. 
  

   It 
  will 
  prove 
  of 
  much 
  use 
  to 
  students 
  in 
  industrial 
  chemistry, 
  as 
  

   the 
  processes 
  are 
  modern 
  and 
  the 
  details 
  are 
  well 
  worked 
  out. 
  

  

  G. 
  F. 
  B. 
  

  

  9. 
  Radioactive 
  Substances. 
  — 
  M. 
  Henri 
  Becquerel 
  has 
  studied 
  

   the 
  phosphorescent 
  effect 
  of 
  the 
  radiation 
  of 
  radium. 
  This 
  sub- 
  

   stance 
  was 
  mixed 
  with 
  a 
  lew 
  milligrams 
  of 
  barium 
  chloride 
  and 
  the 
  

   radiation 
  was 
  directed 
  upon 
  calcium, 
  strontium 
  sulphides, 
  and 
  

   rubies, 
  diamonds, 
  calc 
  spar, 
  fluorite, 
  and 
  hexagonal 
  blende 
  in 
  a 
  

   Becquerel 
  phosphoroscope. 
  It 
  was 
  found 
  that 
  all 
  substances 
  

   which 
  became 
  luminous 
  under 
  the 
  X-rays 
  also 
  showed 
  phosphor- 
  

   escence 
  under 
  the 
  radiations 
  from 
  radium. 
  A 
  species 
  of 
  diamond 
  

   which 
  was 
  very 
  luminous 
  under 
  these 
  radiations 
  did 
  not 
  become 
  

   luminous 
  under 
  the 
  effect 
  of 
  the 
  X-rays. 
  Similar 
  differences 
  were 
  

   observed 
  with 
  other 
  substances. 
  The 
  author 
  concludes 
  that 
  there 
  

   is 
  a 
  loss 
  of 
  energy 
  by 
  radioactive 
  substances. 
  — 
  Comptes 
  Hendus, 
  

   Dec. 
  4, 
  1899, 
  pp. 
  912-917. 
  J. 
  t. 
  

  

  10. 
  Deviation 
  of 
  the 
  Becquerel 
  rays 
  in 
  the 
  magnetic 
  field. 
  — 
  

   F. 
  Giesel 
  shows 
  that 
  these 
  rays 
  are 
  deviated 
  by 
  magnets. 
  A 
  

   preparation 
  of 
  polonium 
  w 
  r 
  as 
  the 
  source 
  of 
  the 
  rays. 
  Radium 
  

   also 
  showed 
  the 
  same 
  phenomenon 
  but 
  not 
  to 
  so 
  high 
  a 
  degree. 
  — 
  

   Wied. 
  Ami., 
  No. 
  12, 
  1899, 
  pp. 
  834-836. 
  "j. 
  t. 
  

  

  