﻿74 
  Scientific 
  Intelligence. 
  

  

  it 
  follows 
  that 
  

  

  where 
  B 
  = 
  N 
  K. 
  Finally 
  (after 
  Dieterici) 
  the 
  influence 
  of 
  the- 
  

   internal 
  forces 
  is 
  taken 
  into 
  account 
  by 
  introducing 
  the 
  Napier- 
  

   ian 
  base 
  to 
  the 
  power 
  — 
  a/B6v. 
  Accordingly, 
  the 
  critical 
  

   volume 
  v' 
  and 
  the 
  gas-constant 
  K 
  are 
  given 
  respectively 
  by 
  

  

  t>' 
  = 
  -=V& 
  = 
  3-1666 
  

   e 
  — 
  1 
  

  

  and 
  JT=^ 
  = 
  3-513. 
  

  

  p 
  v 
  

  

  The 
  equation 
  of 
  van 
  der 
  Waals 
  leads 
  to 
  v 
  ' 
  = 
  3b 
  and 
  K 
  = 
  8/3 
  = 
  

   2-67, 
  and 
  that 
  of 
  Dieterici 
  to 
  v' 
  = 
  25 
  and 
  K 
  = 
  e 
  2 
  /2 
  = 
  3-695. 
  

   For 
  the 
  simpler 
  gases, 
  the 
  value 
  of 
  K 
  deduced 
  by 
  the 
  authors 
  is 
  

   in 
  better 
  accord 
  with 
  the 
  experimental 
  data 
  than 
  Dieterici 
  's 
  

   value 
  e 
  2 
  /2. 
  For 
  oxygen, 
  nitrogen, 
  argon, 
  and 
  xenon 
  the 
  experi- 
  

   mental 
  values 
  of 
  K 
  are 
  3-346, 
  3-53, 
  3-424, 
  and 
  3-605, 
  respectively. 
  

   The 
  limiting 
  volume 
  b 
  equals 
  v'/2 
  according 
  to 
  Dieterici 
  's 
  equa- 
  

   tion, 
  and 
  t>'/3-16 
  according 
  to 
  the 
  formula 
  of 
  the 
  present 
  paper. 
  

   The 
  latter 
  ratio 
  is 
  in 
  better 
  agreement 
  with 
  v'/4 
  which 
  is 
  the 
  

   approximate 
  value 
  obtained 
  by 
  extrapolation 
  of 
  the 
  Cailletet- 
  

   Mathias 
  mean 
  density 
  line 
  to 
  (9 
  = 
  0° 
  absolute. 
  — 
  Phil. 
  Mag., 
  36, 
  

   199, 
  1918. 
  h. 
  s. 
  u. 
  

  

  II. 
  Geology 
  and 
  Natural 
  History. 
  

  

  1. 
  Geology 
  and 
  paleontology 
  of 
  the 
  Baton 
  Mesa 
  and 
  other 
  

   regions 
  in 
  Colorado 
  and 
  New 
  Mexico. 
  Part 
  I. 
  Geology 
  of 
  the 
  

   Baton 
  Mesa 
  and 
  other 
  regions 
  in 
  Colorado 
  and 
  New 
  Mexico; 
  by 
  

   W. 
  T. 
  Lee. 
  Part 
  II. 
  Fossil 
  floras 
  of 
  the 
  Vermejo 
  and 
  Baton 
  

   formations 
  of 
  Colorado 
  and 
  New 
  Mexico; 
  by 
  F. 
  H. 
  Knowlton. 
  

   U. 
  S. 
  Geol. 
  Surv., 
  Prof. 
  Paper 
  101, 
  450 
  pp., 
  103 
  pis., 
  16 
  text 
  figs., 
  

   1917. 
  — 
  This 
  very 
  important 
  memoir 
  not 
  only 
  establishes 
  in 
  detail 
  

   the 
  geology 
  and 
  paleontology 
  of 
  the 
  area 
  investigated, 
  but 
  is 
  

   the 
  most 
  comprehensive 
  work 
  so 
  far 
  published 
  toward 
  the 
  solu- 
  

   tion 
  of 
  what 
  strata 
  in 
  the 
  Rocky 
  Mountains 
  shall 
  be 
  referred 
  to 
  

   the 
  Cretaceous 
  and 
  to 
  the 
  Eocene, 
  and 
  as 
  to 
  which 
  one 
  of 
  the 
  

   several 
  unconformities 
  shall 
  be 
  taken 
  as 
  the 
  dividing 
  line 
  between 
  

   the 
  Mesozoic 
  and 
  Cenozoic 
  eras. 
  There 
  is 
  also 
  a 
  great 
  deal 
  of 
  

   valuable 
  invertebrate 
  paleontology 
  by 
  Doctor 
  Stanton 
  scattered 
  

   throughout 
  the 
  first 
  half 
  of 
  the 
  volume. 
  

  

  Lee 
  is 
  disposed 
  to 
  give 
  full 
  value 
  to 
  the 
  physical 
  phenomena 
  

   and 
  all 
  the 
  more 
  so 
  when, 
  as 
  in 
  this 
  case, 
  the 
  evidence 
  of 
  the 
  

   plants 
  and 
  dinosaurs 
  leads 
  to 
  opposite 
  chronogenetic 
  references. 
  

   He 
  therefore 
  depends 
  most 
  on 
  diastrophism 
  and 
  says 
  that 
  the 
  

   Cretaceous 
  "was 
  a 
  period 
  of 
  inaction" 
  or 
  "quiescence" 
  while 
  

  

  