﻿Smithsonian 
  Report 
  1922. 
  — 
  Humphreys. 
  

  

  Plate 
  5. 
  

  

  I. 
  Cirro-stratus 
  Above, 
  Advection 
  Fog 
  Below; 
  Seen 
  from 
  Mount 
  

  

  Wilson, 
  Calif. 
  

  

  (F. 
  Ellerman, 
  photo.) 
  

  

  2. 
  Halo 
  of 
  22° 
  and 
  Parhelic 
  Circles. 
  

  

  (Contributed 
  by 
  A. 
  M. 
  Comey.) 
  

  

  