﻿F. 
  W. 
  Very 
  — 
  Solar 
  Radiation. 
  635 
  

  

  greater 
  than 
  three 
  requires 
  that 
  a 
  considerable 
  part 
  of 
  the 
  

   earth's 
  heat 
  shall 
  be 
  lost 
  from 
  an 
  atmospheric 
  layer 
  having 
  

   the 
  temperature 
  of 
  the 
  isothermal 
  layer 
  and 
  thus 
  coincides 
  

   with 
  the 
  known 
  phenomena 
  of 
  the 
  upper 
  air.* 
  When 
  we 
  add 
  

   that 
  many 
  other 
  facts, 
  such 
  as 
  the 
  observed 
  temperature 
  of 
  the 
  

   moon,f 
  and 
  the 
  melting 
  of 
  the 
  polar 
  snows 
  on 
  the 
  planet 
  Mars, 
  

   as 
  well 
  as 
  my 
  measurement 
  of 
  the 
  precipitable 
  water 
  vapor 
  in 
  

   its 
  atmosphere^: 
  which 
  confirms 
  the 
  temperature 
  assigned 
  by 
  

   Lowell 
  to 
  Mars,§ 
  all 
  demand 
  an 
  equivalent 
  of 
  solar 
  radiation 
  of 
  

   this 
  order 
  of 
  magnitude, 
  the 
  larger 
  value 
  of 
  the 
  solar 
  con- 
  

   stant 
  appears 
  to 
  be 
  thoroughly 
  established. 
  

  

  Westwood 
  Astrophysical 
  Observatory, 
  

   Westwood, 
  Massachusetts, 
  

   November, 
  1912. 
  

  

  * 
  Frank 
  W. 
  Very 
  : 
  "On 
  the 
  Need 
  of 
  Adjustment 
  of 
  the 
  Data 
  of 
  Terrestrial 
  

   Meteorology 
  and 
  of 
  Solar 
  Radiation, 
  and 
  on 
  the 
  Best 
  Value 
  of 
  the 
  Solar 
  

   Constant," 
  Astrophysical 
  Journal, 
  vol. 
  xxxiv, 
  pp. 
  385-386, 
  December, 
  1911. 
  

  

  f 
  Frank 
  W. 
  Very: 
  "The 
  Probable 
  Range 
  of 
  Temperature 
  on 
  the 
  Moon," 
  

   Astrophysical 
  Journal, 
  vol. 
  viii, 
  pp. 
  199-217, 
  and 
  265-286, 
  November 
  and 
  

   December, 
  1898. 
  Also 
  "Note 
  on 
  the 
  Temperature 
  Assigned 
  by 
  Langley 
  to 
  

   the 
  Moon," 
  Science, 
  N. 
  S., 
  vol. 
  xxxvii, 
  No. 
  964, 
  pp. 
  949-957, 
  June 
  20, 
  1913. 
  

  

  X 
  Frank 
  W. 
  Very: 
  "Measurements 
  of 
  the 
  Intensification 
  of 
  Aqueous 
  

   Bands 
  in 
  the 
  Spectrum 
  of 
  Mars," 
  Lowell 
  Observatory 
  Bulletin 
  No. 
  36, 
  vol. 
  i, 
  

   pp. 
  207-212. 
  "Water 
  Vapor 
  on 
  Mars," 
  do. 
  No. 
  43, 
  vol. 
  i, 
  pp. 
  239-240. 
  

   "New 
  Measures 
  of 
  Martian 
  Absorption 
  Bands 
  on 
  Plate 
  Rm 
  3076," 
  do. 
  No. 
  

   49, 
  vol. 
  i, 
  pp. 
  260-262. 
  See 
  also 
  Science, 
  N. 
  S., 
  vol. 
  xxix, 
  pp. 
  191-193 
  ; 
  

   vol. 
  xxx, 
  pp. 
  678-679 
  ; 
  vol. 
  xxxii, 
  pp. 
  175-177. 
  

  

  § 
  Percival 
  Lowell 
  : 
  "Temperature 
  of 
  Mar6," 
  Proc. 
  American 
  Acad, 
  of 
  Arts 
  

   and 
  Sciences, 
  vol. 
  xlii, 
  No. 
  25, 
  pp. 
  651-667, 
  March, 
  1907. 
  

  

  