﻿486 
  Scientific 
  Intelligence. 
  

  

  body 
  in 
  the 
  regions 
  of 
  important 
  organs, 
  like 
  the 
  heart 
  or 
  lungs. 
  

   He 
  finds 
  a 
  dead 
  cold 
  body 
  more 
  opaque 
  to 
  the 
  rays 
  than 
  a 
  dead 
  

   body 
  which 
  is 
  still 
  warm. 
  (Academy 
  of 
  Arts 
  and 
  Sciences, 
  Paris, 
  

   April 
  12.) 
  W. 
  Crookes, 
  working 
  on 
  the 
  same 
  subject, 
  believes 
  

   that 
  the 
  physiological 
  effects 
  of 
  the 
  X-rays 
  vary 
  greatly 
  with 
  the 
  

   idiosyncrasy 
  of 
  the 
  experimenter 
  ; 
  for 
  he 
  finds 
  no 
  injurious 
  effects 
  

   to 
  himself 
  even 
  after 
  prolonged 
  exposure. 
  — 
  Academy 
  of 
  Sciences, 
  

   Paris, 
  April 
  20. 
  j. 
  t. 
  

  

  13. 
  Influence 
  of 
  magnetism 
  on 
  the 
  nature 
  of 
  light 
  emitted 
  by 
  a 
  

   substance. 
  — 
  Dr. 
  P. 
  Zeeman 
  has 
  observed 
  that 
  the 
  spectral 
  lines 
  

   of 
  sodium 
  are 
  broadened 
  in 
  a 
  strong 
  magnetic 
  field.* 
  Professor 
  

   Lorentz's 
  theory 
  of 
  the 
  motions 
  of 
  ions 
  in 
  a 
  magnetic 
  field 
  

   demands 
  that 
  the 
  edges 
  of 
  the 
  lines 
  of 
  the 
  spectrum 
  should 
  be 
  

   circularly 
  polarized; 
  the 
  amount 
  of 
  widening 
  can 
  also 
  be 
  used 
  

   to 
  determine 
  the 
  ratio 
  between 
  charge 
  and 
  mass 
  when 
  a 
  particle 
  

   is 
  giving 
  out 
  vibrations 
  of 
  light. 
  Dr. 
  Zeeman 
  states 
  that 
  he 
  

   has 
  fully 
  confirmed 
  this 
  theoretical 
  deduction 
  of 
  Professor 
  Lorentz 
  

   by 
  experiment. 
  — 
  Phil. 
  Mag., 
  March, 
  1897, 
  pp. 
  226-239. 
  J. 
  t. 
  

  

  14. 
  First 
  Principles 
  of 
  Natural 
  Philosophy 
  / 
  by 
  A. 
  E. 
  Dol- 
  

   bear, 
  pp. 
  318, 
  12mo, 
  Boston 
  and 
  London, 
  1897. 
  (Ginn 
  & 
  Co.) 
  — 
  

   This 
  little 
  book 
  contains 
  a 
  brief 
  statement 
  of 
  physical 
  principles 
  

   and 
  phenomena 
  put 
  in 
  simple 
  form 
  for 
  elementary 
  students. 
  A 
  

   questionable 
  feature 
  of 
  the 
  work 
  is 
  the 
  change 
  of 
  the 
  usually 
  

   accepted 
  nomenclature 
  of 
  science 
  in 
  some 
  respects, 
  as 
  where 
  the 
  

   word 
  pressure 
  is 
  used 
  for 
  force 
  in 
  discussing 
  energy 
  and 
  work. 
  

  

  I. 
  Geology 
  and 
  Minekalogy. 
  

  

  1. 
  Oongres 
  geologique 
  international. 
  — 
  A 
  third 
  circular, 
  issued 
  

   by 
  the 
  committee 
  of 
  organization 
  of 
  the 
  geological 
  congress 
  to 
  

   be 
  held 
  in 
  Russia 
  this 
  summer, 
  contains 
  the 
  following 
  important 
  

   information. 
  Regarding 
  the 
  scientific 
  program 
  for 
  the 
  session 
  

   of 
  the 
  congress, 
  the 
  committee 
  announce 
  as 
  their 
  opinion 
  that, 
  

   before 
  taking 
  up 
  the 
  other 
  questions 
  left 
  undecided 
  by 
  previous 
  

   sessions, 
  the 
  congress 
  should 
  decide 
  which 
  of 
  these 
  two 
  classifica- 
  

   tions 
  they 
  desire 
  to 
  preserve 
  in 
  science, 
  viz 
  : 
  the 
  artificial 
  classi- 
  

   fication, 
  based 
  entirely 
  upon 
  historical 
  data, 
  or 
  the 
  natural 
  

   classification, 
  which 
  is 
  based 
  as 
  much 
  upon 
  general 
  physico-geo- 
  

   graphical 
  changes, 
  common 
  to 
  all 
  the 
  terrestrial 
  globe, 
  as 
  upon 
  

   faunistic 
  data, 
  and 
  not 
  uj>on 
  the 
  accidental 
  limits 
  of 
  the 
  different 
  

   divisions, 
  called 
  after 
  the 
  name 
  of 
  the 
  country 
  where 
  they 
  have 
  

   been 
  first 
  determined. 
  The 
  data 
  upon 
  which 
  the 
  science 
  actually 
  

   rests 
  are 
  sufficiently 
  numerous 
  for 
  sketching 
  the 
  principal 
  outlines 
  

   of 
  the 
  great 
  physico-geographic 
  changes, 
  such 
  as 
  transgression 
  of 
  

   the 
  seas, 
  the 
  relations 
  between 
  these 
  and 
  general 
  oscillations 
  of 
  

   the 
  continents, 
  the 
  phenomena 
  of 
  dislocation, 
  etc. 
  The 
  compari- 
  

   son 
  of 
  these 
  data 
  with 
  the 
  faunistic 
  data 
  will 
  doubtless 
  make 
  it 
  

   possible 
  to 
  introduce 
  a 
  new 
  grouping 
  of 
  the 
  geologic 
  systems 
  and 
  

   to 
  stop 
  the 
  continual 
  fruitless 
  polemics 
  which 
  • 
  arise 
  from 
  the 
  

   efforts 
  one 
  is 
  obliged 
  to 
  make 
  to 
  put 
  all 
  the 
  new 
  facts, 
  which 
  the 
  

  

  * 
  See 
  further 
  p. 
  4*72 
  of 
  this 
  number. 
  

  

  