﻿Chemistry 
  and 
  Physics. 
  ir>l 
  

  

  masses, 
  special 
  attention 
  being 
  given 
  to 
  Roche's 
  model 
  and 
  to 
  

   the 
  adiabatic 
  model. 
  

  

  Beginning 
  with 
  the 
  eighth 
  chapter 
  the 
  author 
  proceeds 
  to 
  

   clothe 
  the 
  skeleton 
  by 
  applying 
  the 
  abstract 
  results 
  to 
  actual 
  

   problems 
  of 
  astronomy 
  and 
  cosmogony. 
  For 
  lack 
  of 
  space, 
  men- 
  

   tion 
  may 
  be 
  made 
  of 
  only 
  one 
  of 
  the 
  many 
  important 
  conclusions 
  

   obtained 
  by 
  careful 
  comparison 
  of 
  theory 
  with 
  observation, 
  

   which 
  is 
  that 
  Russell 
  's 
  theory 
  of 
  the 
  sequence 
  of 
  stellar 
  evolution 
  

   is 
  fully 
  confirmed. 
  

  

  As- 
  regards 
  the 
  manner 
  of 
  presentation 
  no 
  room 
  for 
  improve- 
  

   ment 
  seems 
  to 
  remain. 
  The 
  author's 
  style 
  is 
  remarkably 
  clear, 
  

   and 
  close 
  contact 
  is 
  maintained 
  throughout 
  between 
  theory 
  and 
  

   observed 
  phenomena. 
  The 
  beautiful 
  plates 
  present 
  striking 
  

   examples 
  of 
  the 
  various 
  forms 
  of 
  nebulas. 
  Whenever 
  appro- 
  

   priate, 
  complete 
  summaries 
  recapitulate 
  the 
  results 
  obtained 
  up 
  

   to 
  that 
  stage 
  of 
  the 
  investigation, 
  so 
  that 
  it 
  is 
  possible 
  to 
  acquire 
  

   much 
  information 
  from 
  the 
  text 
  without 
  following 
  the 
  purely 
  

   mathematical 
  steps. 
  Beyond 
  all 
  question, 
  this 
  book 
  not 
  only 
  

   constitutes 
  a 
  very 
  valuable 
  contribution 
  to 
  the 
  subject 
  but 
  it 
  will 
  

   also 
  be 
  epoch 
  making 
  in 
  the 
  sense 
  that 
  it 
  will 
  form 
  the 
  model 
  

   upon 
  which 
  all 
  subsequent 
  works 
  on 
  the 
  field 
  will 
  be 
  based. 
  

  

  h. 
  s. 
  u. 
  

  

  II. 
  Geology. 
  

  

  1. 
  Fourteenth 
  Report 
  of 
  the 
  Director 
  of 
  the 
  State 
  Museum 
  

   and 
  Science 
  Department; 
  by 
  John 
  M. 
  Clarke. 
  New 
  York 
  

   State 
  Mus., 
  Bulls. 
  207 
  and 
  208, 
  pp. 
  211, 
  pis. 
  and 
  maps, 
  1918 
  

   [1919]. 
  — 
  This 
  interesting 
  report, 
  issued 
  in 
  September 
  1919, 
  

   describes 
  the 
  activities 
  of 
  the 
  State 
  Museum 
  and 
  the 
  State 
  Geo- 
  

   logical 
  Survey 
  during 
  1917. 
  It 
  is 
  accompanied 
  by 
  nine 
  geologic, 
  

   mineralogic, 
  or 
  historic 
  papers. 
  The 
  illustrations 
  of 
  some 
  of 
  the 
  

   museum 
  exhibits 
  show 
  clearly 
  the 
  up-to-date 
  character 
  of 
  this 
  

   leading 
  state 
  museum. 
  The 
  restorations 
  of 
  marine 
  Devonian 
  

   life, 
  and 
  particularly 
  of 
  an 
  orthocerid, 
  a 
  nautilid, 
  and 
  glass 
  

   sponges, 
  surrounded 
  by 
  algae, 
  are 
  exceptionally 
  interesting. 
  

  

  c. 
  s. 
  

  

  2. 
  Outlines 
  of 
  the 
  Geology 
  of 
  Brazil 
  to 
  accompany 
  the 
  Geo- 
  

   logic 
  map 
  of 
  Brazil; 
  by 
  John 
  C. 
  Branner. 
  Bull. 
  Geol. 
  Soc. 
  

   America, 
  vol. 
  30, 
  No. 
  2, 
  pp. 
  189-338, 
  10 
  pis., 
  20 
  text 
  figs., 
  1 
  geol. 
  

   map, 
  1919. 
  — 
  This 
  is 
  by 
  all 
  means 
  the 
  best 
  geologic 
  map 
  of 
  Brazil 
  

   so 
  far 
  published, 
  and 
  is 
  large 
  and 
  well 
  printed. 
  In 
  the 
  accom- 
  

   panying 
  text, 
  the 
  stratigraphy 
  of 
  the 
  various 
  periods 
  is 
  briefly 
  

   described, 
  followed 
  by 
  "Outlines 
  of 
  the 
  general 
  and 
  economic 
  

   geology 
  and 
  bibliography 
  by 
  states," 
  and 
  there 
  are 
  twenty-one 
  

   of 
  them. 
  Then 
  are 
  given 
  outlines 
  of 
  the 
  economic 
  geology, 
  

   taking 
  up 
  first 
  the 
  metallic 
  minerals 
  and 
  next 
  the 
  non-metallic. 
  

   The 
  work 
  is 
  a 
  labor 
  of 
  love 
  and 
  is 
  Branner 
  's 
  contribution 
  to 
  the 
  

  

  Am. 
  Jour. 
  Sci. 
  — 
  Fourth 
  Series, 
  Vol. 
  XLIX, 
  No. 
  290. 
  — 
  February, 
  1920 
  

   11 
  

  

  