﻿F. 
  W. 
  Very 
  — 
  Solar 
  Radiation. 
  625 
  

  

  Aqueous 
  vapor 
  between 
  4-5 
  mm 
  and 
  7"5 
  mm 
  , 
  or 
  about 
  6 
  mm 
  . 
  

  

  

  Date. 
  

  

  No. 
  of 
  

   Obs. 
  

  

  Aq. 
  mm. 
  

  

  e 
  from 
  

  

  to 
  

  

  Mean 
  A. 
  

  

  At 
  mean 
  

  

  solar 
  

   distance. 
  

  

  1906 
  

  

  June 
  16 
  

  

  20 
  

  

  6 
  

  

  40 
  

  

  2 
  

  

  96 
  

  

  0'89 
  

  

  3 
  

  

  415 
  

  

  3-510 
  

  

  

  " 
  19 
  

  

  23 
  

  

  5 
  

  

  68 
  

  

  2 
  

  

  99 
  

  

  0-83 
  

  

  3 
  

  

  251 
  

  

  3-342 
  

  

  

  " 
  20 
  

  

  16 
  

  

  5 
  

  

  79 
  

  

  2 
  

  

  00 
  

  

  0*84 
  

  

  3 
  

  

  377 
  

  

  3-471 
  

  

  

  " 
  22 
  

  

  16 
  

  

  5 
  

  

  81 
  

  

  2 
  

  

  10 
  

  

  0-83 
  

  

  3 
  

  

  399 
  

  

  3-494 
  

  

  

  " 
  23 
  

  

  16 
  

  

  5 
  

  

  79 
  

  

  2 
  

  

  40 
  

  

  0-92 
  

  

  3 
  

  

  358 
  

  

  3-453 
  

  

  

  " 
  30 
  

  

  16 
  

  

  5 
  

  

  72 
  

  

  2 
  

  

  56 
  

  

  0-89 
  

  

  3 
  

  

  348 
  

  

  3-444 
  

  

  

  July 
  3 
  

  

  14 
  

  

  7 
  

  

  46 
  

  

  2 
  

  

  37 
  

  

  0-89 
  

  

  3 
  

  

  415 
  

  

  3-514 
  

  

  

  " 
  18 
  

  

  14 
  

  

  7 
  

  

  18 
  

  

  2 
  

  

  66 
  

  

  0-93 
  

  

  3 
  

  

  495 
  

  

  3-591 
  

  

  

  " 
  28 
  

  

  16 
  

  

  7- 
  

  

  08 
  

  

  2 
  

  

  60 
  

  

  0-91 
  

  

  3 
  

  

  480 
  

  

  3-570 
  

  

  

  " 
  31 
  

  

  16 
  

  

  6 
  

  

  92 
  

  

  2 
  

  

  Q5 
  

  

  0*87 
  

  

  3 
  

  

  716 
  

  

  3-808 
  

  

  

  Aug. 
  1 
  

  

  14 
  

  

  5 
  

  

  22 
  

  

  2 
  

  

  70 
  

  

  0-92 
  

  

  3 
  

  

  550 
  

  

  3-637 
  

  

  

  3 
  

  

  16 
  

  

  4 
  

  

  58 
  

  

  2 
  

  

  92 
  

  

  0*90 
  

  

  3 
  

  

  343 
  

  

  3-423 
  

  

  

  " 
  4 
  

  

  16 
  

  

  6 
  

  

  24 
  

  

  2 
  

  

  67 
  

  

  0-93 
  

  

  3 
  

  

  516 
  

  

  3-599 
  

  

  

  7 
  

  

  16 
  

  

  5 
  

  

  17 
  

  

  2 
  

  

  38 
  

  

  0-86 
  

  

  3 
  

  

  337 
  

  

  3-413 
  

  

  

  " 
  15 
  

  

  12 
  

  

  6- 
  

  

  92 
  

  

  2 
  

  

  73 
  

  

  1-10 
  

  

  3 
  

  

  306 
  

  

  3-371 
  

  

  

  " 
  29 
  

  

  8 
  

  

  6 
  

  

  03 
  

  

  2 
  

  

  32 
  

  

  1-17 
  

  

  3 
  

  

  008 
  

  

  3*049 
  

  

  

  " 
  31 
  

  

  20 
  

  

  6 
  

  

  61 
  

  

  2 
  

  

  76 
  

  

  0-90 
  

  

  3 
  

  

  252 
  

  

  3-294 
  

  

  

  Sept. 
  1 
  

  

  15 
  

  

  5 
  

  

  18 
  

  

  2 
  

  

  48 
  

  

  0-91 
  

  

  3 
  

  

  296 
  

  

  3-336 
  

  

  

  4 
  

  

  7 
  

  

  4 
  

  

  52 
  

  

  3 
  

  

  09 
  

  

  1-00 
  

  

  3 
  

  

  393 
  

  

  3*430 
  

  

  

  5 
  

  

  16 
  

  

  5 
  

  

  02 
  

  

  3 
  

  

  01 
  

  

  0-93 
  

  

  3 
  

  

  361 
  

  

  3-394 
  

  

  

  " 
  11 
  

  

  12 
  

  

  4 
  

  

  68 
  

  

  2 
  

  

  95 
  

  

  0-94 
  

  

  3 
  

  

  426 
  

  

  3-449 
  

  

  

  " 
  20 
  

  

  12 
  

  

  4 
  

  

  71 
  

  

  3 
  

  

  22 
  

  

  0-98 
  

  

  3 
  

  

  208 
  

  

  3-214 
  

  

  

  " 
  25. 
  

  

  12 
  

  

  4 
  

  

  72 
  

  

  3 
  

  

  06 
  

  

  1-01 
  

  

  3 
  

  

  268 
  

  

  3-265 
  

  

  

  " 
  28 
  

  

  14 
  

  

  5 
  

  

  14 
  

  

  3 
  

  

  60 
  

  

  1-00 
  

  

  3 
  

  

  336 
  

  

  3-328 
  

  

  

  Oct. 
  2 
  

  

  11 
  

  

  5 
  

  

  81 
  

  

  2-79 
  

  

  J-03 
  

  

  3-354 
  

  

  3-337 
  

  

  Mean 
  

  

  Aq.= 
  

  

  5 
  

  

  775 
  

  

  

  Mean 
  

  

  A= 
  

  

  3-430 
  

  

  the 
  free 
  air. 
  No 
  readings 
  of 
  the 
  barometer 
  are 
  available, 
  and 
  

   I 
  am 
  therefore 
  obliged 
  to 
  assume 
  an 
  average 
  pressure 
  for 
  the 
  

   mountain, 
  which 
  is 
  taken 
  = 
  618 
  mra 
  . 
  Accordingly 
  the 
  air 
  mass 
  

   is 
  made 
  = 
  (618 
  / 
  760) 
  X 
  sec. 
  K 
  = 
  0-813 
  sec. 
  £ 
  * 
  The 
  results 
  are 
  

   given 
  in 
  the 
  tables 
  on 
  pp. 
  623-626, 
  grouped 
  approximately 
  for 
  

   aqueous 
  vapor 
  pressures 
  of 
  3, 
  6 
  and 
  9 
  mm 
  . 
  

  

  The 
  mean 
  values, 
  with 
  two 
  others 
  which 
  fall 
  outside 
  the 
  

   limits 
  of 
  the 
  classification, 
  are 
  plotted 
  in 
  fig. 
  2. 
  

  

  Aqueous 
  

  

  vapor 
  

  

  = 
  3-340 
  

  

  A: 
  

  

  = 
  3-246 
  (26 
  

  

  observations). 
  

  

  a 
  

  

  a 
  

  

  5-775 
  

  

  

  3-430(25 
  

  

  )• 
  

  

  a 
  

  

  u 
  

  

  5-942 
  

  

  

  3-485 
  (26 
  

  

  )• 
  

  

  ic 
  

  

  a 
  

  

  8-861 
  

  

  

  3-744(23 
  

  

  )• 
  

  

  a 
  

  

  u 
  

  

  12-44 
  

  

  

  4-391 
  ( 
  1 
  

  

  )• 
  

  

  u 
  

  

  (f 
  

  

  13-84 
  

  

  

  4-489 
  ( 
  1 
  

  

  ). 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XXXVI, 
  No. 
  216. 
  — 
  December, 
  1913. 
  

   42 
  

  

  