﻿Geology. 
  303 
  

  

  ciably 
  enlarged 
  as 
  compared 
  with 
  the 
  first. 
  An 
  entire 
  chapter 
  

   has 
  been 
  added 
  in 
  which 
  many 
  complex 
  phenomena 
  of 
  great 
  

   technical 
  importance 
  are 
  discussed. 
  The 
  additional 
  matter 
  

   includes 
  Whittaker's 
  work 
  on 
  the 
  relation 
  between 
  surface 
  energy 
  

   and 
  internal 
  latent 
  heat, 
  a 
  summary 
  of 
  recent 
  theories 
  on 
  the 
  

   structure 
  and 
  properties 
  of 
  metals, 
  Ferguson's 
  equation 
  connect- 
  

   ing 
  surface 
  tension 
  and 
  absolute 
  temperature, 
  a 
  number 
  of 
  short 
  

   paragraphs 
  on 
  adsorption, 
  etc. 
  Certain 
  mathematical 
  proofs 
  are 
  

   given 
  in 
  two 
  appendixes 
  which 
  are 
  followed 
  by 
  both 
  author 
  and 
  

   subject 
  indexes. 
  

  

  The 
  manner 
  of 
  presentation 
  is 
  simple 
  and 
  clear, 
  and 
  the 
  text 
  

   should 
  be 
  useful 
  to 
  students 
  of 
  colloidal 
  chemistry 
  and 
  of 
  biology. 
  

   There 
  is, 
  however, 
  much 
  room 
  for 
  improvement 
  in 
  two 
  respects, 
  

   (a) 
  the 
  units 
  involved 
  are, 
  in 
  some 
  cases, 
  incorrect 
  in 
  the 
  sense 
  

   of 
  being 
  incomplete, 
  and 
  (6) 
  the 
  number 
  of 
  typographical 
  errors 
  

   is 
  excessively 
  large 
  for 
  a 
  second 
  edition. 
  h. 
  s. 
  u. 
  

  

  II. 
  Geology. 
  

  

  1. 
  Lineas 
  generates 
  de 
  la 
  estratigrafia 
  del 
  Neocomiano 
  en 
  la 
  

   Cordillera 
  Argentina; 
  por 
  Anselmo 
  Windhausen. 
  Bol. 
  Acad. 
  

   Nac. 
  de 
  Ciencias 
  de 
  Cordoba, 
  vol. 
  23, 
  pp. 
  97-128. 
  Buenos 
  Aires, 
  

   1918. 
  — 
  The 
  Lower 
  Cretaceous 
  faunas 
  and 
  deposits 
  of 
  southern 
  

   South 
  America 
  have 
  long 
  been 
  of 
  interest 
  to 
  geologists. 
  Darwin 
  

   when 
  on 
  the 
  voyage 
  of 
  the 
  Beagle 
  collected 
  a 
  few 
  fossils 
  of 
  that 
  

   age 
  near 
  the 
  Strait 
  of 
  Magellan, 
  and 
  since 
  that 
  time 
  scientific 
  

   travelers 
  and 
  explorers 
  have 
  proved 
  that 
  the 
  Lower 
  Cretaceous 
  

   is 
  well 
  developed 
  in 
  the 
  Argentine 
  Cordillera 
  and 
  distributed 
  

   through 
  many 
  degrees 
  of 
  latitude. 
  The 
  collections 
  thus 
  accu- 
  

   mulated 
  have 
  furnished 
  material 
  for 
  many 
  descriptive 
  papers 
  by 
  

   Behrendsen, 
  Steuer, 
  Burckhardt, 
  Stanton, 
  Favre, 
  Douville, 
  Stol- 
  

   ley, 
  and 
  others, 
  and 
  for 
  discussions 
  of 
  the 
  general 
  relations 
  of 
  

   the 
  fauna 
  by 
  Uhlig, 
  Burckhardt, 
  and 
  others. 
  These 
  collections 
  

   were 
  usually 
  small 
  and 
  obtained 
  at 
  widely 
  separated 
  localities, 
  

   with 
  insufficient 
  study 
  of 
  local 
  stratigraphy 
  and 
  usually 
  no 
  study 
  

   of 
  intervening 
  areas. 
  Even 
  such 
  fragmentary 
  studies 
  in 
  connec- 
  

   tion 
  with 
  Burckhardt 
  's 
  work 
  in 
  Mexico 
  brought 
  out 
  resemblances 
  

   in 
  Upper 
  Jurassic 
  and 
  Lower 
  Cretaceous 
  faunas 
  which 
  led 
  Uhlig 
  

   to 
  speak 
  of 
  a 
  "south 
  Andean 
  realm" 
  extending 
  from 
  northern 
  

   Mexico 
  to 
  the 
  southern 
  point 
  of 
  South 
  America 
  and 
  even 
  to 
  South 
  

   Africa, 
  because 
  what 
  he 
  called 
  the 
  ' 
  ' 
  austral 
  fauna 
  of 
  Trigonias 
  ' 
  ' 
  

   is 
  found 
  in 
  all 
  these 
  regions. 
  

  

  During 
  the 
  last 
  few 
  years 
  the 
  government 
  of 
  Argentina 
  

   through 
  its 
  "Direction 
  general 
  de 
  Minas, 
  Geologia 
  e 
  Hidrologia" 
  

   has 
  been 
  carrying 
  on 
  more 
  systematic 
  investigations 
  in 
  the 
  Cor- 
  

   dillera 
  of 
  Mendoza 
  and 
  Neuquen 
  (S. 
  lat. 
  32° 
  -41°) 
  in 
  connection 
  

   with 
  which 
  Windhausen 
  is 
  preparing 
  a 
  monograph 
  of 
  the 
  Neo- 
  

   comian 
  cephalopod 
  fauna 
  — 
  especially 
  the 
  Upper 
  Neocomian. 
  

  

  