﻿Smithsonian 
  Report 
  1922. 
  — 
  Humphreys. 
  

  

  Plate 
  22. 
  

  

  I. 
  Scarf 
  Cloud, 
  on 
  Top 
  of 
  Cumulus. 
  

  

  (W. 
  A. 
  Bentley, 
  photo.) 
  

  

  2. 
  TONITRO-CIRRUS 
  (FALSE 
  CIRRUS), 
  OVER 
  THE 
  VALLEY 
  OF 
  VIRGINIA. 
  

  

  (A. 
  J. 
  Weed, 
  photo.) 
  

  

  