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  Scientific 
  Intelligence. 
  

  

  is 
  a 
  small 
  Plesiosaur, 
  which 
  may 
  be 
  called 
  Parasaurus 
  striatus. 
  

   One 
  specimen 
  only 
  has 
  been 
  found 
  in 
  northern 
  Wyoming. 
  

  

  The 
  Atlantosaurns 
  beds 
  of 
  the 
  upper 
  Jurassic 
  are 
  now 
  

   known 
  to 
  be 
  one 
  of 
  the 
  best 
  marked 
  horizons 
  yet 
  discovered. 
  

   They 
  have 
  been 
  traced 
  for 
  more 
  than 
  four 
  hundred 
  miles 
  

   along 
  the 
  eastern 
  flank 
  of 
  the 
  Rocky 
  mountains, 
  and 
  nearly 
  

   everywhere 
  contain 
  great 
  numbers 
  of 
  fossil 
  vertebrates, 
  espe- 
  

   cially 
  gigantic 
  Dinosaurs 
  and 
  other 
  reptiles, 
  as 
  well 
  as 
  many 
  

   diminutive 
  mammals 
  of 
  primitive 
  types. 
  The 
  same 
  deposits 
  

   have 
  been 
  found 
  on 
  the 
  western 
  slope, 
  with 
  the 
  Baptanodon 
  

   beds 
  beneath 
  them. 
  ' 
  

  

  The 
  most 
  remarkable 
  of 
  the 
  new 
  horizons 
  recently 
  deter- 
  

   mined 
  are 
  the 
  Ceratops 
  beds 
  in 
  the 
  Laramie 
  series, 
  at 
  the 
  top 
  

   of 
  the 
  Cretaceous. 
  This 
  horizon 
  is 
  as 
  strongly 
  marked 
  as 
  that 
  

   of 
  the 
  Atlantosaurus 
  beds, 
  and 
  has 
  now 
  been 
  traced 
  for 
  nearly 
  

   eight 
  hundred 
  miles 
  along 
  the 
  eastern 
  base 
  of 
  the 
  Rocky 
  

   mountains. 
  Toward 
  the 
  north, 
  it 
  is 
  underlaid 
  by 
  marine 
  

   Cretaceous 
  strata 
  containing 
  Fox 
  Hill 
  fossils, 
  but 
  further 
  

   south, 
  various 
  older 
  formations 
  are 
  found 
  immediately 
  beneath 
  

   it. 
  The 
  overlying 
  strata, 
  when 
  present, 
  are 
  usually 
  of 
  Tertiary 
  

   age. 
  The 
  Fort 
  Union 
  Eocene 
  beds 
  on 
  the 
  upper 
  Missouri, 
  the 
  

   Brontotherium 
  beds 
  of 
  the 
  Miocene 
  in 
  Wyoming, 
  and 
  further 
  

   south 
  in 
  Colorado 
  the 
  Pliohippus 
  beds 
  of 
  the 
  Pliocene, 
  may 
  

   be 
  seen 
  immediately 
  above. 
  The 
  vertebrate 
  fauna 
  of 
  the 
  

   Ceratops 
  beds 
  is 
  remarkably 
  rich 
  and 
  varied. 
  The 
  gigantic 
  

   horned 
  Dinosaurs 
  named 
  by 
  the 
  author 
  the 
  Ceratopsidce 
  espe- 
  

   cially 
  abound, 
  and 
  determine 
  the 
  horizon 
  with 
  accuracy. 
  Other 
  

   Dinosaurs 
  are 
  numerous 
  ; 
  and 
  a 
  few 
  Birds, 
  and 
  various 
  Mammals 
  

   of 
  Mesozoic 
  types 
  have 
  also 
  been 
  secured. 
  

  

  In 
  the 
  various 
  horizons 
  of 
  the 
  Tertiary, 
  as 
  repeated 
  in 
  the 
  

   present 
  section, 
  no 
  changes 
  of 
  importance 
  have 
  been 
  required, 
  

   as 
  more 
  recent 
  discoveries 
  fully 
  confirm 
  their 
  value 
  and 
  accurate 
  

   determination. 
  

  

  SCIENTIFIC 
  INTELLIGENCE. 
  

  

  I. 
  Chemistry 
  and 
  Physics. 
  

  

  1. 
  On 
  the 
  Absorption 
  Spectrum 
  of 
  Liquid 
  Oxygen. 
  — 
  In 
  a 
  pre- 
  

   liminary 
  examination 
  of 
  the 
  absorption 
  spectrum 
  of 
  liquified 
  

   oxygen, 
  Olszewski 
  observed 
  four 
  bands 
  corresponding 
  to 
  the 
  

   wave 
  lengths 
  628, 
  577, 
  535 
  and 
  480, 
  these 
  bands 
  being 
  the 
  same 
  

   as 
  those 
  noted 
  by 
  Liveing 
  and 
  Dewar 
  in 
  the 
  spectrum 
  of 
  gaseous 
  

   oxygen 
  at 
  high 
  pressures, 
  in 
  addition 
  to 
  two 
  bands 
  in 
  the 
  ultra 
  

   red 
  agreeing 
  with 
  the 
  Fraunhofer 
  lines 
  A 
  and 
  B. 
  More 
  recently 
  

   Olszewski 
  has 
  prepared 
  liquid 
  oxygen 
  in 
  larger 
  quantity 
  and 
  has 
  

   examined 
  its 
  absorption 
  spectrum 
  more 
  critically. 
  Usino- 
  a 
  layer 
  

  

  