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  Scientific 
  Intelligence. 
  

  

  8. 
  An 
  Introduction 
  to 
  Astronomy. 
  New 
  and 
  Revised 
  Edi- 
  

   tion 
  ; 
  by 
  Forest 
  Kay 
  Moulton. 
  Pp. 
  xxii, 
  577. 
  New 
  York, 
  

   1916 
  (The 
  Macmillan 
  Co.). 
  — 
  The 
  present 
  volume 
  has 
  been 
  entirely 
  

   rewritten. 
  " 
  As 
  in 
  the 
  first 
  edition, 
  the 
  aim 
  has 
  been 
  to 
  present 
  

   the 
  great 
  subject 
  of 
  astronomy 
  so 
  that 
  it 
  can 
  be 
  easily 
  compre- 
  

   hended 
  even 
  by 
  a 
  person 
  who 
  has 
  not 
  had 
  extensive 
  scientific 
  

   training." 
  Since 
  it 
  is 
  impossible 
  to 
  even 
  begin 
  to 
  do 
  justice 
  to 
  

   this 
  elegant 
  book 
  in 
  a 
  brief 
  notice 
  it 
  seems 
  desirable 
  to 
  suggest 
  

   its 
  scope 
  by 
  quoting 
  the 
  titles 
  or 
  sub-titles 
  of 
  the 
  chapters, 
  which 
  

   are 
  : 
  I 
  Preliminary 
  Considerations. 
  II 
  The 
  Shape 
  of 
  the 
  Earth. 
  

   The 
  Mass 
  of 
  the 
  Earth 
  and 
  the 
  Condition 
  of 
  Its 
  Interior. 
  The 
  

   Earth's 
  Atmosphere. 
  Ill 
  The 
  Rotation 
  of 
  the 
  Earth. 
  The 
  

   Revolution 
  of 
  the 
  Earth. 
  IV 
  Reference 
  Points 
  and 
  Lines. 
  

   V 
  The 
  Constellations. 
  VI 
  Time. 
  VII 
  The 
  Moon. 
  VIII 
  The 
  

   Law 
  of 
  Gravitation. 
  Orbits, 
  Dimensions, 
  and 
  Masses 
  of 
  the 
  

   Planets. 
  IX 
  Mercury 
  and 
  Venus. 
  Mars. 
  Jupiter. 
  Saturn. 
  

   Uranus 
  and 
  Neptune. 
  X 
  Comets. 
  Meteors. 
  XI 
  The 
  Sun's 
  

   Heat. 
  Spectrum 
  Analysis. 
  The 
  Constitution 
  of 
  the 
  Sun. 
  XII 
  

   General 
  Considerations 
  on 
  Evolution. 
  Data 
  of 
  Problem 
  of 
  Evo- 
  

   lution 
  of 
  Solar 
  System. 
  The 
  Planetesimal 
  Theory. 
  Historical 
  

   Cosmogonies, 
  and 
  XIII 
  The 
  Apparent 
  Distribution 
  of 
  the 
  Stars. 
  

   Distances 
  and 
  Motions 
  of 
  the 
  Stars. 
  The 
  Stars. 
  The 
  Nebulae. 
  

  

  With 
  regard 
  to 
  details 
  no 
  pains 
  seem 
  to 
  have 
  been 
  spared, 
  

   either 
  by 
  the 
  author 
  or 
  by 
  the 
  publishers, 
  to 
  make 
  the 
  volume 
  as 
  

   attractive 
  and 
  useful 
  as 
  possible. 
  Of 
  the 
  194 
  figures 
  no 
  less 
  than 
  

   68 
  are 
  photographic 
  illustrations, 
  those 
  pertaining 
  to 
  the 
  moon, 
  

   the 
  Pleiades, 
  comets 
  and 
  nebulas 
  being 
  especially 
  beautiful. 
  Five 
  

   star 
  maps 
  have 
  been 
  incorporated 
  to 
  enable 
  the 
  reader 
  to 
  quickly 
  

   recognize 
  the 
  constellations. 
  Lists 
  of 
  problems 
  (243) 
  have 
  been 
  

   given 
  at 
  the 
  ends 
  of 
  the 
  principal 
  divisions 
  of 
  the 
  chapters. 
  

   "They 
  cannot 
  be 
  correctly 
  answered 
  without 
  a 
  real 
  comprehen- 
  

   sion 
  of 
  the 
  principles 
  which 
  they 
  involve, 
  and 
  in 
  very 
  many 
  cases, 
  

   especially 
  in 
  the 
  later 
  chapters, 
  they 
  lead 
  to 
  important 
  supple- 
  

   mentary 
  results." 
  The 
  volume 
  closes 
  with 
  both 
  author 
  and 
  sub- 
  

   ject 
  indexes. 
  Unquestionably 
  this 
  book 
  is 
  the 
  most 
  up 
  to 
  date 
  

   and 
  inspiring 
  presentation 
  of 
  the 
  subject 
  that 
  the 
  writer 
  of 
  this 
  

   notice 
  has 
  ever 
  seen. 
  h. 
  s. 
  xj. 
  

  

  II. 
  Geology 
  and 
  Mineralogy. 
  

  

  1. 
  Some 
  Geophysical 
  Observations 
  at 
  -Burrinjnch 
  y 
  by 
  Leo 
  

   A. 
  Cotton. 
  Proc. 
  Roy. 
  Soc. 
  N. 
  S. 
  Wales, 
  vol. 
  xlix, 
  pp. 
  448-462, 
  

   1915. 
  — 
  Studies 
  of 
  the 
  strength 
  of 
  the 
  earth's 
  crust 
  resulting 
  in 
  

   the 
  contrasted 
  doctrines 
  of 
  high 
  rigidity 
  and 
  of 
  isostasy 
  have 
  

   dealt 
  largely 
  with 
  the 
  validity 
  of 
  assumptions 
  and 
  the 
  discussion 
  

   ef 
  theoretical 
  conclusions. 
  Experimental 
  observations 
  have 
  been 
  

   concerned 
  chiefly 
  with 
  the 
  crushing 
  strength 
  of 
  rocks 
  under 
  actual 
  

   and 
  hypothetical 
  conditions. 
  The 
  results 
  of 
  geophysical 
  research 
  

   have 
  so 
  far 
  been 
  unable 
  to 
  answer 
  the 
  question 
  raised 
  by 
  geolo- 
  

  

  