﻿Titicaca 
  Island 
  and 
  Adjoining 
  Areas. 
  

  

  193 
  

  

  Berglalund 
  reports* 
  that 
  during 
  twenty- 
  three 
  years' 
  residence 
  

   at 
  Desaguadero 
  the 
  annual 
  fluctuation 
  reached 
  five 
  or 
  six 
  feet 
  

   and 
  that 
  the 
  level 
  in 
  1906, 
  following 
  four 
  years 
  of 
  deficient 
  

   rainfall, 
  was 
  considerably 
  lower 
  than 
  in 
  1909. 
  Such 
  variations 
  

   are 
  not 
  uncommon 
  in 
  lakes 
  of 
  the 
  world, 
  even 
  in 
  humid 
  regions 
  

  

  Fig. 
  3. 
  

  

  Fig. 
  3. 
  Bay 
  of 
  Puno, 
  showing 
  a 
  typical 
  portion 
  of 
  the 
  deltas 
  extending 
  

   into 
  Lake 
  Titicaca 
  from 
  the 
  northwest. 
  

  

  marked 
  by 
  climatic 
  regularity. 
  A 
  seasonal 
  or 
  cyclical 
  change 
  

   in 
  climate, 
  taken 
  in 
  connection 
  with 
  river-borne 
  sediments, 
  is 
  

   sufficient 
  to 
  account 
  for 
  all 
  authentic 
  facts 
  so 
  far 
  reported, 
  

   without 
  involving 
  a 
  hypothesis 
  regarding 
  the 
  geological 
  history 
  

   * 
  Geog. 
  Soc. 
  de 
  Lima, 
  Tonio 
  X. 
  

  

  