﻿Mean 
  Annual 
  Temperature 
  Variation. 
  405 
  

  

  peratures 
  increasing 
  from 
  17*6° 
  to 
  19'3° 
  C. 
  This 
  line 
  6 
  is 
  

   evidently 
  discordant 
  : 
  it 
  cuts 
  all 
  the 
  others. 
  The 
  summer 
  maxi- 
  

   mum 
  is 
  3° 
  below 
  the 
  maximum 
  which 
  would 
  be 
  observed 
  if 
  

   curve 
  4 
  were 
  fully 
  developed. 
  The 
  summer 
  temperature 
  may, 
  

   therefore, 
  be 
  considered 
  abnormally 
  low. 
  Now, 
  between 
  6 
  and 
  

   4 
  we 
  observe 
  the 
  fragments 
  of 
  a 
  curve 
  5 
  extending 
  from 
  May 
  

   22d 
  to 
  June 
  8th 
  and 
  July 
  29th 
  to 
  Aug. 
  26th. 
  This 
  curve 
  

   intersects 
  all 
  the 
  others 
  : 
  its 
  amplitude 
  is 
  evidently 
  much 
  

   smaller 
  than 
  the 
  amplitude 
  of 
  curves 
  1-4. 
  

  

  Although 
  the 
  temperature 
  curve 
  for 
  Warsaw 
  may 
  be 
  con- 
  

   sidered 
  a 
  most 
  typical 
  example 
  of 
  the 
  normal 
  anomalies 
  of 
  

   the 
  annual 
  temperature 
  variation, 
  the 
  breaks 
  being 
  too 
  well 
  

   accentuated 
  to 
  be 
  ascribed 
  to 
  chance 
  circumstances, 
  it 
  is 
  useful 
  

  

  Fig. 
  3. 
  

  

  ' 
  '' 
  '' 
  ,->v~~ 
  N 
  \ 
  N 
  " 
  

  

  to 
  cite 
  a 
  few 
  other 
  examples 
  in 
  order 
  to 
  show 
  how, 
  gradually, 
  

   we 
  pass 
  from 
  one 
  type 
  of 
  variation 
  to 
  another. 
  

  

  Hellmann 
  has 
  published* 
  a 
  detailed 
  curve 
  of 
  the 
  daily 
  means 
  

   derived 
  from 
  the 
  observations 
  made 
  in 
  Berlin 
  during 
  the 
  years 
  

   1848-1907. 
  Referring 
  to 
  the 
  diagram 
  for 
  Warsaw 
  (fig. 
  3), 
  the 
  

   Berlin 
  curve 
  displays 
  the 
  fragments 
  1 
  to 
  4, 
  5 
  is 
  missing 
  and 
  6 
  

   is 
  a 
  well-developed 
  curve 
  extending 
  from 
  June 
  13th 
  to 
  Sept. 
  

   21st, 
  with 
  a 
  maximum 
  on 
  July 
  22d. 
  

  

  From 
  March 
  13th 
  to 
  April 
  7th 
  the 
  increase 
  in 
  temperature 
  

   is 
  abnormally 
  rapid 
  so 
  that 
  3 
  is 
  discordant 
  with 
  2 
  and 
  4. 
  The 
  

   drop 
  of 
  temperature 
  between 
  4 
  and 
  6 
  (June 
  6-11) 
  is 
  1*5° 
  C. 
  This 
  

   is 
  perhaps 
  the 
  most 
  characteristic 
  feature 
  of 
  the 
  curve. 
  Besides, 
  

   4 
  and 
  6 
  are 
  discordant. 
  Phase 
  6 
  has 
  a 
  smaller 
  amplitude 
  than 
  4. 
  

  

  Evidently 
  if 
  many 
  curves 
  were 
  available 
  it 
  would 
  be 
  interest- 
  

   ing 
  to 
  follow 
  the 
  progressive 
  change 
  from 
  station 
  to 
  station. 
  

   That 
  these 
  anomalies 
  do 
  not 
  occur 
  simultaneously 
  at 
  different 
  

  

  •*Preuss. 
  Met. 
  Inst., 
  Abh., 
  v. 
  3, 
  No. 
  6, 
  Berlin, 
  1910. 
  

  

  