﻿650 
  Scientific 
  Intelligence. 
  

  

  chaining 
  fanden 
  wir 
  Irrtum 
  und 
  Verwirrung." 
  " 
  Die 
  Weltans- 
  

   chauung 
  M. 
  Verworns 
  wlirde, 
  wenn 
  sie 
  richtig 
  ware, 
  statt 
  Licht 
  

   Dunkel 
  verbreiten." 
  h. 
  s. 
  u. 
  

  

  15. 
  Annals 
  of 
  the 
  Astrophysical 
  Observatory 
  of 
  the 
  Smithso- 
  

   nian 
  Institution 
  ; 
  by 
  C. 
  G. 
  Abbot, 
  Director, 
  F. 
  E. 
  Fowle 
  and 
  

   L. 
  B. 
  Aldrich. 
  Vol. 
  Ill, 
  pp. 
  xi, 
  241, 
  with 
  7 
  plates 
  and 
  32 
  figures. 
  

   Washington, 
  1913. 
  — 
  Since 
  the 
  publication 
  of 
  the 
  second 
  volume 
  

   of 
  the 
  " 
  Annals" 
  in 
  1907 
  a 
  large 
  number 
  of 
  data, 
  obtained 
  by 
  

   means 
  of 
  the 
  pyrheliometer 
  and 
  the 
  spectrobolometer, 
  have 
  been 
  

   accumulated 
  and 
  reduced. 
  Observations 
  were 
  made 
  at 
  three 
  

   stations 
  in 
  addition 
  to 
  Washington, 
  D. 
  C, 
  namely, 
  at 
  Mount 
  Wil- 
  

   son 
  (1,730 
  meters), 
  Mount 
  Whitney, 
  Cal. 
  (4,420 
  meters), 
  and 
  near 
  

   Bassour, 
  Algeria 
  (1,160 
  meters). 
  The 
  object 
  of 
  the 
  principal 
  

   investigation 
  was 
  " 
  to 
  determine 
  the 
  intensity 
  of 
  the 
  solar 
  radia- 
  

   tion, 
  as 
  it 
  is 
  in 
  free 
  space 
  at 
  the 
  earth's 
  mean 
  solar 
  distance, 
  and 
  

   to 
  detect 
  variations 
  of 
  the 
  sun's 
  emission 
  if 
  these 
  exceed 
  1 
  per 
  

   cent." 
  The 
  mean 
  value 
  of 
  the 
  solar 
  constant 
  of 
  radiation 
  for 
  the 
  

   epoch 
  1902-1912, 
  resulting 
  from 
  696 
  observations, 
  was 
  found 
  to 
  

   be 
  1*932 
  calories 
  (15°) 
  per 
  square 
  centimeter 
  per 
  minute. 
  Fur- 
  

   thermore, 
  when 
  high 
  values 
  of 
  the 
  solar 
  radiation 
  were 
  observed 
  

   at 
  Mount 
  Wilson, 
  high 
  values 
  were 
  also 
  found 
  at 
  Bassour 
  and 
  

   vice 
  versa. 
  " 
  The 
  measurements 
  seem, 
  in 
  fact, 
  to 
  prove 
  conclu- 
  

   sively 
  that 
  the 
  radiation 
  of 
  the 
  sun 
  is 
  subject 
  to 
  a 
  variation, 
  occur- 
  

   ring 
  irregularly 
  in 
  periods 
  of 
  a 
  week 
  or 
  10 
  days, 
  and 
  whose 
  

   fluctuations 
  are 
  also 
  irregular 
  in 
  magnitude, 
  but 
  usually 
  within 
  

   the 
  range 
  of 
  7 
  per 
  cent." 
  " 
  In 
  addition 
  to 
  this 
  short 
  period 
  vari- 
  

   ability 
  of 
  the 
  sun, 
  thus 
  disclosed, 
  an 
  intimate 
  association 
  between 
  

   the 
  intensity 
  of 
  solar 
  radiation 
  and 
  the 
  prevalence 
  of 
  sun 
  spots 
  

   appears 
  to 
  be 
  strongly 
  indicated". 
  " 
  This 
  relation 
  is 
  such 
  that 
  

   the 
  greater 
  the 
  number 
  of 
  sun 
  spots 
  the 
  higher 
  is 
  the 
  intensity 
  of 
  

   the 
  solar 
  radiation". 
  Another 
  important 
  conclusion 
  reached 
  is, 
  

   " 
  that 
  while 
  the 
  intensities 
  of 
  rays 
  of 
  all 
  wave 
  lengths 
  fall 
  with 
  

   the 
  decrease 
  of 
  the 
  total 
  solar 
  radiation, 
  the 
  decrease 
  is 
  much 
  

   more 
  rapid 
  for 
  the 
  shorter 
  wave 
  rays 
  than 
  for 
  the 
  longer". 
  

  

  The 
  appendix 
  (pp. 
  169-229) 
  contains 
  reprints 
  from 
  the 
  Astro- 
  

   physical 
  and 
  other 
  journals 
  on 
  the 
  spectroscopic 
  determination 
  of 
  

   aqueous 
  vapor, 
  the 
  determination 
  of 
  aqueous 
  vapor 
  above 
  Mount 
  

   Wilson, 
  the 
  sun's 
  energy-spectrum 
  and 
  temperature, 
  the. 
  bright- 
  

   ness 
  of 
  the 
  sky 
  at 
  night 
  as 
  observed 
  on 
  Mount 
  Whitney, 
  and 
  vol- 
  

   canoes 
  and 
  climate. 
  This 
  very 
  valuable 
  contribution 
  to 
  the 
  

   subject 
  closes 
  with 
  a 
  list 
  of 
  papers 
  published 
  by 
  members 
  of 
  the 
  

   observatory 
  staff. 
  h. 
  s. 
  u. 
  

  

  II. 
  Geology 
  and 
  Mineralogy. 
  

  

  1. 
  Research 
  in 
  China. 
  Vol. 
  III. 
  The 
  Cambrian 
  faunas 
  of 
  

   China, 
  by 
  Charles 
  D. 
  Walcott 
  ; 
  A 
  report 
  on 
  Of 
  'dovician 
  fos- 
  

   sils 
  collected 
  in 
  eastern 
  Asia 
  in 
  1903-0 
  %, 
  by 
  Stuart 
  Weller 
  ; 
  

   A 
  report 
  on 
  Upper 
  Paleozoic 
  fossils 
  collected 
  in 
  China 
  in 
  1903- 
  

   04, 
  by 
  George 
  H. 
  Girty. 
  Pp. 
  375 
  ; 
  29 
  pis.., 
  9 
  text 
  figs., 
  1913 
  

  

  