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  Scientific 
  Intelligence. 
  

  

  been 
  identified 
  only 
  by 
  Schumann 
  — 
  and 
  by 
  him 
  only 
  in 
  a 
  vacuum. 
  

   Lenard 
  calls 
  attention 
  to 
  some 
  experiments 
  made 
  in 
  the 
  Alps 
  

   by 
  him 
  in 
  1889, 
  which 
  showed 
  the 
  effect 
  of 
  sunlight 
  in 
  dissipat- 
  

   ing 
  electrical 
  charges. 
  Since 
  the 
  spectrum 
  of 
  the 
  sun's 
  chromo- 
  

   sphere 
  and 
  the 
  protuberances 
  show 
  the 
  presence 
  of 
  hydrogen, 
  and 
  

   Schumann's 
  results 
  show 
  that 
  this 
  gas 
  is 
  especially 
  rich 
  in 
  the 
  

   short 
  waves 
  which 
  are 
  absorbed 
  by 
  the 
  earth's 
  atmosphere, 
  it 
  is 
  

   reasonable 
  to 
  attribute 
  the 
  results 
  obtained 
  by 
  Lenard 
  in 
  the 
  

   Alps 
  to 
  the 
  ultra-violet 
  rays, 
  which 
  are 
  absorbed 
  at 
  lower 
  alti- 
  

   tudes. 
  — 
  Ann. 
  der 
  Physik., 
  No. 
  3, 
  1900, 
  pp. 
  486-507. 
  J. 
  t. 
  

  

  6. 
  Dielectric 
  Constant 
  of 
  Water 
  and 
  Hydrogen 
  peroxide. 
  — 
  

   H. 
  T. 
  Calvert 
  has 
  determined 
  the 
  dielectric 
  constant 
  of 
  hydrogen 
  

   superoxide 
  by 
  means 
  of 
  electrical 
  waves 
  according 
  to 
  the 
  method 
  

   of 
  Drude. 
  The 
  wave 
  length 
  that 
  was 
  employed 
  had 
  X=1o 
  cm 
  and 
  

   only 
  a 
  trace 
  of 
  electrical 
  absorption 
  was 
  shown. 
  The 
  constant 
  

   obtained 
  for 
  the 
  hydrogen 
  peroxide 
  — 
  H 
  2 
  2 
  — 
  was 
  92*8, 
  while 
  

   that 
  of 
  water, 
  H 
  2 
  at 
  18°, 
  was 
  81. 
  The 
  hydrogen 
  peroxide 
  has 
  

   therefore 
  a 
  much 
  greater 
  dielectric 
  constant 
  than 
  pure 
  water. 
  — 
  

   Ann. 
  der 
  Physik., 
  No. 
  3, 
  1900, 
  pp. 
  483-485. 
  j. 
  t. 
  

  

  7. 
  Quincke's 
  Potations 
  in 
  an 
  Electric 
  Field. 
  — 
  This 
  investi- 
  

   gator 
  showed 
  that 
  a 
  sphere 
  of 
  paraffine-ebonite 
  or 
  sulphur 
  is 
  set 
  in 
  

   rotation 
  when 
  charged 
  and 
  suspended 
  in 
  an 
  electric 
  field. 
  This 
  

   rotation 
  is 
  due 
  to 
  the 
  repulsion 
  of 
  the 
  electricity 
  residing 
  on 
  the 
  

   surface 
  of 
  the 
  spheres 
  by 
  the 
  electricity 
  on 
  the 
  neighboring 
  

   electrodes 
  between 
  which 
  the 
  revolving 
  bodies 
  are 
  suspended. 
  

   L. 
  Graetz 
  shows 
  that 
  the 
  conductibility 
  of 
  poor 
  conductors 
  and 
  

   its 
  changes 
  under 
  varying 
  conditions 
  can 
  be 
  determined 
  by 
  

   Quincke's 
  phenomenon. 
  The 
  effect 
  of 
  the 
  X-rays 
  also 
  in 
  changing 
  

   the 
  conductibility 
  of 
  such 
  substances 
  and 
  of 
  gases 
  can 
  be 
  studied 
  

   by 
  the 
  same 
  means. 
  — 
  Ann. 
  der 
  Physik., 
  No. 
  3, 
  1900, 
  pp. 
  530-541. 
  

  

  J. 
  T. 
  

  

  II. 
  Geology 
  and 
  Natural 
  History. 
  

  

  1. 
  The 
  Slate 
  Belt 
  of 
  Eastern 
  New 
  York 
  and 
  Western 
  Vermont; 
  

   by 
  T. 
  Nelson 
  Dale. 
  (Extract 
  from 
  19th 
  Annual 
  Report 
  of 
  U. 
  S. 
  

   Geol. 
  Survey, 
  pp. 
  153-307.)— 
  Few 
  regions 
  of 
  equal 
  extent 
  offer 
  

   such 
  difficult 
  problems 
  in 
  stratigraphy 
  and 
  structural 
  geology 
  as 
  

   the 
  two 
  counties 
  along 
  the 
  New 
  York-Vermont 
  boundary 
  de- 
  

   scribed 
  in 
  this 
  report. 
  Walcott 
  has 
  discussed 
  in 
  several 
  papers 
  

   the 
  paleontologic 
  teachings 
  of 
  the 
  area, 
  and 
  the 
  economic 
  import- 
  

   ance 
  of 
  this 
  region, 
  which 
  produces 
  one 
  quarter 
  of 
  the 
  roofing 
  

   slate 
  used 
  in 
  the 
  United 
  States, 
  has 
  long 
  been 
  known. 
  Prof. 
  Dale 
  

   has 
  surveyed 
  the 
  field 
  anew 
  and 
  has 
  made 
  a 
  combined 
  economic 
  

   and 
  scientific 
  study 
  of 
  the 
  complicated 
  area 
  with 
  special 
  attention 
  

   to 
  the 
  intricate 
  structural 
  relations 
  existing 
  there. 
  Ten 
  sections 
  

   were 
  worked 
  out 
  across 
  the 
  slates 
  and 
  adjoining 
  schists 
  at 
  import- 
  

   ant 
  and 
  favorable 
  points 
  and 
  the 
  general 
  structural 
  features 
  found 
  

   to 
  be 
  as 
  follows 
  : 
  " 
  The 
  strata 
  of 
  the 
  schist 
  mass 
  on 
  the 
  east, 
  

   closely 
  plicated 
  and 
  cleft 
  with 
  easterly 
  dipping 
  slip 
  cleavage, 
  lie 
  in 
  

  

  