﻿0. 
  L. 
  Fassig 
  — 
  March 
  Weather 
  in 
  the 
  United 
  States. 
  323 
  

  

  The 
  general 
  circulation 
  of 
  the 
  atmosphere 
  due 
  simply 
  to 
  

   difference 
  in 
  temperature 
  between 
  the 
  equator 
  and 
  the 
  poles, 
  

   would 
  produce 
  a 
  belt 
  of 
  high 
  pressure 
  around 
  the 
  globe 
  near 
  

   latitude 
  30° 
  I^. 
  The 
  differences 
  of 
  temperature 
  which 
  are 
  

   produced 
  over 
  the 
  globe 
  between 
  neighboring 
  regions, 
  and 
  

   especially 
  between 
  continents 
  and 
  seas 
  in 
  the 
  same 
  latitude, 
  by 
  

   changing 
  the 
  density 
  of 
  the 
  lower 
  strata 
  of 
  the 
  atmosphere, 
  

   destroy 
  the 
  regularity 
  of 
  the 
  isobars 
  (as 
  observed 
  in 
  the 
  

   southern 
  hemisphere) 
  and 
  bring 
  about 
  the 
  formation 
  of 
  closed 
  

   areas 
  of 
  high 
  or 
  low 
  pressure 
  which 
  break 
  up 
  the 
  zones, 
  as 
  

   shown 
  in 
  the 
  northern 
  hemisphere. 
  (See 
  Plate 
  VI.) 
  

  

  In 
  these 
  researches 
  of 
  M. 
  Teisserenc 
  de 
  Bort 
  we 
  have 
  the 
  

   first 
  indications 
  of 
  a 
  method 
  which 
  may 
  lead 
  to 
  long-range 
  

   forecasts. 
  Yan 
  Bebber"'^ 
  suggests 
  that 
  the 
  barometric 
  maxima 
  

   owe 
  their 
  origin 
  and 
  life 
  mostly 
  to 
  the 
  upper 
  air 
  currents 
  ; 
  so 
  

   that 
  the 
  air 
  masses 
  which 
  are 
  carried 
  up 
  in 
  certain 
  regions, 
  

   even 
  in 
  the 
  high 
  latitudes 
  and 
  in 
  the 
  lower 
  atmosphere, 
  go 
  to 
  

   build 
  up 
  the 
  highs. 
  The 
  usual 
  explanation, 
  he 
  maintains, 
  that 
  

   the 
  barometric 
  maxima 
  are 
  fed 
  by 
  passing 
  depressions, 
  does 
  

   not 
  suffice, 
  and 
  leads 
  to 
  many 
  contradictions. 
  

  

  General 
  Greely 
  maintainsf 
  that 
  '• 
  a 
  study 
  of 
  the 
  annual 
  

   barometric 
  fluctuations 
  will 
  reveal 
  their 
  intimate 
  connection 
  

   with 
  the 
  prevalent 
  types 
  of 
  weather 
  or 
  climate, 
  so 
  that 
  

   abnormal 
  departures 
  in 
  certain 
  regions 
  will 
  be 
  recognized 
  as 
  

   dominating 
  factors 
  in 
  j^roducing, 
  later 
  in 
  the 
  season, 
  abnormal 
  

   weather 
  conditions 
  in 
  other 
  and 
  quite 
  distant 
  sections 
  of 
  the 
  

   world." 
  That 
  " 
  annual 
  atmospheric 
  waves, 
  with 
  their 
  crests 
  

   and 
  troughs, 
  move 
  over 
  the 
  northern 
  hemisphere 
  somewhat 
  in 
  

   the 
  same 
  manner 
  as 
  the 
  waves 
  of 
  high 
  pressure, 
  known 
  as 
  cold 
  

   waves, 
  move 
  throughout 
  the 
  winter 
  months 
  from 
  the 
  interior 
  

   to 
  the 
  Atlantic 
  seaboard." 
  

  

  Mr. 
  Eliot,:}: 
  the 
  Meteorological 
  Reporter 
  to 
  the 
  Government 
  

   of 
  India, 
  seems 
  to 
  have 
  established: 
  

  

  1. 
  That 
  there 
  are 
  well-marked 
  pressure 
  oscillations 
  of 
  long 
  

   period 
  over 
  the 
  Indian 
  area. 
  

  

  2. 
  That 
  they 
  are 
  directly 
  related 
  to 
  the 
  largest 
  and 
  most 
  

   important 
  features 
  of 
  the 
  weather 
  in 
  India, 
  viz 
  : 
  the 
  character 
  

   and 
  distribution 
  of 
  the 
  precipitation 
  of 
  rain 
  and 
  snow 
  in 
  the 
  

   Indian 
  monsoon 
  area. 
  

  

  3. 
  That 
  they 
  are 
  also 
  directly 
  related 
  to 
  the 
  great 
  atmos- 
  

   pheric 
  movements 
  over 
  India. 
  

  

  * 
  J. 
  van 
  Bebber, 
  Typlsclie 
  Witterungserschelnungea. 
  Arcliiv 
  der 
  deutschen 
  

   Seewarte, 
  v. 
  1882. 
  4'. 
  Hamburg, 
  1882. 
  

  

  f 
  lalernational 
  p-'essnre 
  and 
  siorm 
  charts. 
  Report 
  of 
  Chief 
  Signal 
  Officer 
  for 
  

   1891. 
  Washington, 
  1891, 
  page 
  750 
  

  

  \ 
  J. 
  Eliot, 
  A 
  preliminary 
  discussion 
  of 
  certain 
  oscillatory 
  changes 
  of 
  pressure 
  

   of 
  long 
  period 
  and 
  short 
  period 
  in 
  India. 
  Indian 
  Met'i. 
  Mem., 
  vol. 
  vi, 
  part 
  ii, 
  

   Calcutta, 
  1895, 
  page 
  117. 
  

  

  