﻿Smithsonian 
  Report 
  1922. 
  — 
  Humphreys. 
  

  

  Plate 
  12. 
  

  

  I. 
  Cumulus, 
  Forming 
  from 
  Fog 
  — 
  Rare, 
  Seen 
  from 
  Mount 
  Wilson, 
  Calif. 
  

  

  (F. 
  Ellerman, 
  photo.) 
  

  

  2. 
  Cumulus, 
  Seen 
  from 
  Mount 
  Wilson, 
  Calif. 
  

  

  (F. 
  Ellerman. 
  photo.) 
  

  

  