﻿64:6 
  Scientific 
  Intelligence. 
  

  

  It 
  is 
  a 
  very 
  interesting 
  book, 
  and 
  it 
  will 
  be 
  extremely 
  useful, 
  not 
  

   only 
  to 
  students 
  of 
  the 
  present 
  day 
  as 
  a 
  clear 
  and 
  simple 
  treat- 
  

   ment 
  of 
  the 
  subject, 
  but 
  it 
  is 
  also 
  a 
  very 
  suitable 
  source 
  of 
  infor- 
  

   mation 
  for 
  those 
  whose 
  knowledge 
  of 
  chemistry 
  has 
  not 
  been 
  

   brought 
  up 
  to 
  the 
  present 
  time. 
  From 
  the 
  fact 
  that 
  Professor 
  

   Jones 
  has 
  studied 
  with 
  three 
  leaders 
  of 
  the 
  modern 
  movement 
  — 
  

   Van't 
  Hoff, 
  Arrhenius, 
  and 
  Ostwald, 
  he 
  is 
  particularly 
  competent 
  

   to 
  discuss 
  their 
  work 
  and 
  achievements. 
  In 
  an 
  appendix 
  he 
  has 
  

   given 
  some 
  very 
  interesting 
  personal 
  reminiscences 
  of 
  Mendeleeff, 
  

   Kekule, 
  Willard 
  Gibbs, 
  Van't 
  Hoff, 
  Arrhenius, 
  and 
  Ostwald. 
  

  

  h. 
  l. 
  w. 
  

  

  5. 
  Experiments 
  Arranged 
  for 
  Students 
  in 
  General 
  Chemistry 
  ; 
  

   by 
  Edgar 
  F. 
  Smith 
  and 
  Harry 
  F. 
  Keller. 
  12mo, 
  pp. 
  56. 
  

   Philadelphia, 
  1913 
  (P. 
  Blakiston's 
  Son 
  & 
  Co. 
  Price 
  60c. 
  net). 
  — 
  

   This 
  is 
  a 
  laboratory 
  book 
  for 
  beginners 
  in 
  chemistry, 
  involving 
  a 
  

   short 
  course 
  in 
  the 
  subject. 
  It 
  is 
  intended 
  to 
  be 
  used 
  with 
  any 
  

   text-book. 
  It 
  not 
  only 
  describes 
  experiments, 
  but 
  asks 
  many 
  

   questions 
  in 
  connection 
  with 
  them. 
  The 
  experiments 
  appear 
  to 
  

   be 
  very 
  well 
  chosen, 
  and 
  the 
  numerous 
  questions 
  should 
  be 
  very 
  

   useful 
  in 
  helping 
  the 
  student 
  to 
  gain 
  valuable 
  knowledge 
  from 
  

   the 
  course 
  of 
  laboratory 
  work. 
  h. 
  l. 
  w. 
  

  

  6. 
  Chemical 
  German; 
  by 
  Francis 
  C. 
  Phillips. 
  8vo, 
  pp. 
  

   241. 
  Easton, 
  Pa., 
  1913 
  (The 
  Chemical 
  Publishing 
  Co.). 
  —This 
  

   book 
  gives 
  simple 
  exercises 
  for 
  practice 
  in 
  translating 
  chemical 
  

   German 
  ; 
  it 
  explains 
  the 
  nomenclature, 
  contains 
  a 
  collection 
  of 
  

   very 
  well 
  selected, 
  interesting 
  extracts 
  from 
  chemical 
  writings, 
  

   and 
  includes 
  a 
  vocabulary 
  of 
  technical 
  and 
  other 
  words. 
  It 
  

   appears 
  to 
  be 
  an 
  excellent 
  book 
  for 
  the 
  purpose 
  of 
  aiding 
  our 
  

   advanced 
  students 
  in 
  the 
  somewhat 
  difficult 
  matter 
  of 
  applying 
  

   their 
  school 
  German 
  to 
  chemical 
  literature. 
  h. 
  l. 
  w. 
  

  

  7. 
  Spectrum 
  of 
  the 
  Aurora 
  JBorealis. 
  — 
  In 
  order 
  to 
  obtain, 
  if 
  

   possible, 
  more 
  accurate 
  data 
  relating 
  to 
  the 
  northern 
  lights, 
  an 
  

   expedition 
  to 
  Bossekop 
  in 
  Finmark 
  was 
  made 
  during 
  the 
  winter 
  

   of 
  1912-13 
  by 
  L. 
  Vegard. 
  With 
  a 
  direct-vision 
  spectroscope 
  28 
  

   observations 
  of 
  the 
  green 
  line 
  were 
  made 
  and 
  the 
  mean 
  of 
  the 
  set- 
  

   tings 
  gave, 
  when 
  reduced, 
  a 
  wave-length 
  of 
  5573*7 
  A. 
  The 
  

   stronger 
  auroral 
  displays 
  made 
  it 
  possible 
  to 
  distinguish 
  a 
  few 
  

   lines 
  in 
  the 
  blue. 
  The 
  two 
  most 
  intense 
  lines 
  could 
  alone 
  be 
  

   studied 
  quantitatively 
  and 
  the 
  wave-lengths 
  were 
  found 
  to 
  be 
  

   5 
  271 
  '5 
  and 
  4708*3 
  for 
  the 
  weaker 
  and 
  stronger 
  lines 
  respectively. 
  

   Several 
  faint 
  lines 
  in 
  the 
  neighborhood 
  of 
  A 
  5271 
  were 
  discernible. 
  

  

  The 
  most 
  reliable 
  data 
  were 
  obtained 
  photographically 
  by 
  

   means 
  of 
  a 
  prism 
  spectrograph 
  having 
  a 
  dispersion 
  between 
  H/? 
  

   and 
  Hy 
  five 
  times 
  as 
  great 
  as 
  had 
  ever 
  been 
  used 
  before 
  on 
  the 
  

   same 
  problem. 
  Four 
  spectrograms 
  were 
  obtained, 
  the 
  shortest 
  

   time 
  of 
  exposure 
  being 
  10 
  hours 
  and 
  the 
  longest 
  1 
  month. 
  The 
  

   mean 
  wave-lengths 
  derived 
  from 
  the 
  plates 
  are 
  5571*3, 
  4708*0, 
  

   4646*8, 
  4278*0, 
  4234*2, 
  4200*3, 
  and 
  3914*6. 
  The 
  average 
  of 
  the 
  

   numbers 
  5573*7 
  and 
  5571*3 
  (as 
  obtained 
  by 
  the 
  visual 
  and 
  photo- 
  

   graphic 
  methods 
  respectively), 
  namely 
  5572*5, 
  agrees 
  very 
  well 
  

  

  