﻿564 
  Scientific 
  Intelligence. 
  

  

  also 
  the 
  practical 
  applications 
  of 
  the 
  science 
  are 
  extensively 
  elabo- 
  

   rated. 
  It 
  is 
  the 
  sequel 
  of 
  a 
  similar 
  volume 
  on 
  inorganic 
  chemistry 
  

   by 
  the 
  same 
  author, 
  which 
  has 
  already 
  been 
  noticed 
  in 
  this 
  depart- 
  

   ment 
  of 
  this 
  Journal, 
  and, 
  like 
  the 
  preceding 
  volume, 
  it 
  is 
  recom- 
  

   mended 
  as 
  a 
  very 
  useful 
  and 
  important 
  book 
  of 
  reference 
  and 
  

   study 
  for 
  chemical 
  students. 
  It 
  contains 
  a 
  vast 
  amount 
  of 
  accu- 
  

   rate 
  information 
  in 
  regard 
  to 
  manufacturing 
  operations 
  and 
  statis- 
  

   tics 
  of 
  production. 
  h. 
  l. 
  w. 
  

  

  6. 
  Chemistry 
  and 
  its 
  Relations, 
  to 
  Daily 
  Life; 
  by 
  Louis 
  

   Kahlenberg 
  and 
  Edwin 
  B. 
  Hart. 
  12mo, 
  pp. 
  393. 
  New 
  York, 
  

   1913 
  (The 
  Macmillan 
  Company). 
  — 
  This 
  text-book 
  is 
  intended 
  par- 
  

   ticularly 
  for 
  the 
  use 
  of 
  students 
  of 
  agriculture 
  and 
  home 
  economics 
  

   in 
  secondary 
  schools. 
  It 
  does 
  not 
  go 
  very 
  deeply 
  into 
  pure 
  chem- 
  

   istry, 
  but 
  it 
  explains 
  the 
  more 
  fundamental 
  and 
  useful 
  chemical 
  

   theories 
  and 
  the 
  more 
  important 
  general 
  facts 
  in 
  a 
  very 
  satisfactory 
  

   manner, 
  and 
  it 
  gives 
  a 
  good 
  exposition 
  of 
  the 
  chemistry 
  of 
  daily 
  

   life. 
  This 
  seems 
  to 
  be 
  a 
  very 
  suitable 
  book 
  for 
  the 
  perusal 
  of 
  

   persons, 
  outside 
  of 
  school, 
  who 
  wish 
  to 
  gain 
  an 
  insight 
  into 
  

   chemistry. 
  h. 
  l. 
  w. 
  

  

  7. 
  Studies 
  in 
  Yaleney 
  ; 
  by 
  F. 
  H. 
  Loring. 
  12mo, 
  pp. 
  47. 
  Lon- 
  

   don, 
  1913 
  (iSimpkins, 
  Marshall, 
  Hamilton, 
  Kent 
  & 
  Co., 
  Ld. 
  Price 
  

   2s. 
  6d., 
  net). 
  — 
  This 
  little 
  book 
  deals 
  with 
  speculations 
  in 
  regard 
  to 
  

   variable 
  valency 
  and 
  the 
  relation 
  of 
  valency 
  to 
  the 
  periodic 
  sys- 
  

   tem. 
  These 
  speculations, 
  as 
  far 
  as 
  they 
  are 
  original, 
  do 
  not 
  

   appear 
  to 
  be 
  important 
  contributions 
  to 
  chemical 
  theory, 
  but 
  they 
  

   may 
  be 
  of 
  interest 
  to 
  those 
  who 
  make 
  a 
  special 
  study 
  of 
  these 
  

   relations. 
  h. 
  l. 
  w. 
  

  

  8. 
  The 
  Deviation 
  of 
  Rubidium 
  Rays 
  in 
  Magnetic 
  Fields. 
  — 
  

   The 
  question 
  as 
  to 
  whether 
  slow 
  a-rays 
  or 
  /3-rays 
  accompany 
  the 
  

   disintegration 
  of 
  rubidium 
  has 
  been 
  settled 
  by 
  an 
  investigation 
  

   of 
  Karl 
  Bergwitz. 
  The 
  apparatus 
  used 
  consisted 
  essentially 
  of 
  

   a 
  rectangular 
  zinc 
  box 
  which 
  was 
  screwed 
  in 
  place 
  over 
  the 
  stem 
  

   of 
  a 
  Wulf 
  bifilar 
  electrometer. 
  This 
  box 
  was 
  divided 
  into 
  two 
  

   compartments 
  by 
  a 
  partition 
  made 
  of 
  the 
  finest 
  cigarette 
  paper. 
  

   The 
  larger 
  compartment 
  was 
  symmetrically 
  placed 
  with 
  respect 
  

   to 
  the 
  stem 
  of 
  the 
  electrometer 
  and 
  it 
  constituted 
  the 
  ionization 
  

   chamber. 
  The 
  smaller 
  room 
  was 
  eccentric, 
  it 
  had 
  20 
  grams 
  of 
  

   rubidium 
  chloride 
  on 
  its 
  floor, 
  and 
  it 
  was 
  situated 
  between 
  the 
  

   poles 
  of 
  an 
  electro-magnet. 
  

  

  In 
  performing 
  an 
  experiment 
  the 
  normal 
  loss 
  of 
  potential 
  in 
  

   nine 
  hours 
  was 
  first 
  observed 
  with 
  the 
  rubidium 
  salt 
  in 
  the 
  adja- 
  

   cent 
  chamber. 
  Then 
  the 
  electro-magnet 
  was 
  excited 
  and 
  the 
  

   decrease 
  of 
  potential 
  in 
  nine 
  hours 
  was 
  again 
  determined. 
  Next 
  

   the 
  magnetic 
  field 
  was 
  removed 
  and 
  the 
  normal 
  leak 
  tested 
  as 
  in 
  

   the 
  first 
  instance. 
  Finally 
  the 
  magnetic 
  field 
  was 
  excited 
  in 
  the 
  

   reverse 
  direction 
  and 
  the 
  loss 
  for 
  nine 
  hours 
  was 
  read. 
  The 
  

   initial 
  potential 
  difference 
  was 
  always 
  chosen 
  as 
  250 
  volts. 
  In 
  

   older 
  to 
  obtain 
  information 
  concerning 
  the 
  softness 
  of 
  the 
  rays 
  

   the, 
  series 
  of 
  measurements 
  was 
  repeated 
  with 
  different 
  magnetic 
  

   field 
  strengths. 
  The 
  numerical 
  data 
  and 
  curves 
  show 
  that 
  the 
  

  

  