﻿34 
  JOURNAL 
  OF 
  THE 
  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  VOL. 
  12, 
  NO. 
  2 
  

  

  curves 
  at 
  uniform 
  intervals 
  and 
  taking 
  the 
  mean 
  of 
  the 
  readings 
  over 
  

   a 
  period 
  of 
  14 
  months, 
  the 
  effect 
  of 
  the 
  14-month 
  term 
  would 
  be 
  made 
  to 
  

  

  1900 
  

  

  1805 
  

  

  1910 
  

  

  1915 
  

  

  Fig. 
  3. 
  The 
  latitude 
  of 
  Tschardjui, 
  Russian 
  Turkestan: 
  means 
  by 
  calendar 
  years 
  and 
  lines 
  

   showing 
  adjusted 
  rates 
  of 
  change; 
  derived 
  from 
  the 
  latitudes 
  of 
  the 
  International 
  

   Latitude 
  Service. 
  

  

  disappear 
  from 
  the 
  mean, 
  leaving 
  only 
  the 
  effects 
  of 
  a 
  shifting 
  of 
  the 
  

   zero 
  line, 
  that 
  is, 
  of 
  a 
  progressive 
  change 
  in 
  the 
  mean 
  latitude. 
  

  

  