﻿118 
  EEPORT 
  UNITED 
  STATES 
  ENTOMOLOGICAL 
  COMMISSION. 
  

  

  Table 
  III 
  is 
  so 
  imperfect 
  that 
  it 
  is 
  of 
  but 
  little 
  value, 
  and 
  moreover 
  it 
  is 
  

   formed 
  of 
  the 
  averages 
  of 
  monthly 
  means 
  of 
  the 
  rainfall 
  of 
  all 
  the 
  

   stations, 
  varying 
  from 
  two 
  or 
  three 
  to 
  twelve 
  or 
  fifteen 
  in 
  a 
  State. 
  As- 
  

   new 
  stations 
  are 
  added 
  they 
  may 
  very 
  materially 
  change 
  the 
  average 
  

   from 
  what 
  it 
  would 
  otherwise 
  be. 
  Although 
  a 
  combination 
  of 
  this 
  kind,, 
  

   of 
  the 
  rain-fall 
  records 
  at 
  different 
  stations 
  over 
  a 
  State 
  or 
  Territory,, 
  

   may 
  be 
  valuable 
  as 
  showing 
  the 
  average 
  rain-fall 
  over 
  a 
  State 
  for 
  a. 
  

   single 
  year, 
  it 
  is 
  of 
  little 
  or 
  no 
  value 
  as 
  expressing 
  the 
  variation 
  in 
  

   different 
  years, 
  uuless 
  from 
  the 
  same 
  stations. 
  It 
  is 
  given, 
  therefore,, 
  

   simply 
  as 
  one 
  means 
  of 
  enabling 
  the 
  reader 
  to 
  form 
  a 
  general 
  idea 
  of 
  the 
  

   rain-fall 
  in 
  the 
  Northwest 
  in 
  the 
  years 
  specified. 
  

  

  Table 
  No. 
  IV, 
  showing 
  the 
  monthly 
  and 
  annual 
  means 
  of 
  the 
  tempera- 
  

   ture, 
  consists 
  of 
  the 
  average 
  means 
  of 
  all 
  the 
  stations 
  in 
  the 
  State, 
  as 
  

   the 
  preceding, 
  but 
  is 
  more 
  complete 
  and 
  of 
  more 
  value 
  in 
  the 
  discus- 
  

   sion 
  of 
  the 
  question 
  we 
  are 
  now 
  considering. 
  As 
  will 
  be 
  seen 
  by 
  refer- 
  

   ence 
  to 
  the 
  annual 
  averages 
  it 
  corresponds 
  generally 
  with 
  what 
  has 
  

   already 
  been 
  said 
  in 
  reference 
  to 
  the 
  temperature 
  of 
  1866, 
  though 
  not 
  in 
  

   a 
  marked 
  degree. 
  

  

  The 
  year 
  1865, 
  according 
  to 
  this 
  table, 
  appears 
  to 
  have 
  been 
  as 
  warm 
  

   as 
  any, 
  if 
  not 
  the 
  warmest, 
  of 
  the 
  five. 
  But 
  the 
  differences 
  are 
  too 
  slight 
  

   to 
  indicate 
  any 
  law 
  bearing 
  upon 
  the 
  locust 
  problem. 
  An 
  examination 
  

   of 
  the 
  monthly 
  averages 
  also 
  fails 
  to 
  reveal 
  anything 
  worthy 
  of 
  notice 
  

   in 
  this 
  connection 
  unless 
  it 
  be 
  that 
  July 
  as 
  a 
  rule 
  was 
  warmer 
  in 
  1864 
  

   and 
  1866 
  than 
  in 
  the 
  other 
  years. 
  The 
  only 
  fact 
  which 
  can 
  be 
  drawn 
  

   from 
  the 
  table 
  which 
  appears 
  to 
  be 
  of 
  any 
  value 
  in 
  this 
  discussion 
  is 
  

   shown 
  by 
  the 
  following 
  exhibit 
  of 
  the 
  extreme 
  variations 
  in 
  the 
  monthly 
  

   means, 
  and 
  this 
  only 
  because 
  it 
  appears 
  to 
  correspond 
  somewhat 
  with, 
  

   what 
  will 
  hereafter 
  be 
  shown 
  in 
  reference 
  to 
  the 
  years 
  1872-'78. 
  

  

  Table 
  V. 
  — 
  Extreme 
  variations 
  of 
  monthly 
  mean 
  temperature 
  from 
  1863 
  to 
  1867. 
  

  

  January 
  . 
  . 
  . 
  

   February 
  . 
  . 
  

  

  March 
  

  

  April...... 
  

  

  May 
  

  

  June 
  

  

  July 
  

  

  August 
  

  

  September 
  

   October 
  . 
  . 
  . 
  

   November 
  . 
  

   December. 
  

  

  Months. 
  

  

  10.4 
  

  

  13.5 
  

  

  15.7 
  

  

  5.3 
  

  

  12.9 
  

  

  5.8 
  

  

  7.2 
  

  

  5.4 
  

  

  11. 
  G 
  

  

  8.9 
  

  

  8.0 
  

  

  13.8 
  

  

  12.5 
  

  

  19.9 
  

  

  9.2 
  

  

  15.2 
  

  

  7.4 
  

  

  7.3 
  

  

  7.5 
  

  

  13.9 
  

  

  10.1 
  

  

  6.0 
  

  

  8.4 
  

  

  19.2 
  

  

  11.7 
  

  

  12.8 
  

  

  8.0 
  

  

  10.8 
  

  

  3.6 
  

  

  3.7 
  

  

  4.7 
  

  

  13.2 
  

  

  9.2 
  

  

  6.2 
  

  

  11.9 
  

  

  6.5 
  

   9.4 
  

  

  19.0 
  

   8.6 
  

  

  14.0 
  

   6.9 
  

   7.6 
  

   6.6 
  

  

  12.9 
  

   8.3 
  

   8.5 
  

  

  13.7 
  

  

  13.9 
  

   7.9 
  

  

  20.3 
  

   7.9 
  

   8.1 
  

   6.4 
  

   6.6 
  

   2.8 
  

  

  13.8 
  

  

  15.2 
  

   9.8 
  

  

  10.9 
  

  

  12.8 
  

  

  11. 
  

  

  17. 
  5. 
  

  

  7.8 
  

  

  12.2 
  

  

  6.0 
  

  

  0.5 
  

  

  5.4 
  

  

  13.1 
  

  

  10.3 
  

  

  7.7 
  

  

  10.9 
  

  

  An 
  inspection 
  of 
  the 
  averages 
  shows 
  that 
  the 
  chief 
  variations 
  are 
  in 
  

   the 
  winter 
  or 
  cold 
  months, 
  from 
  December 
  to 
  March. 
  The 
  variations 
  

   in 
  May 
  and 
  September 
  are 
  somewhat 
  remarkable, 
  and, 
  as 
  will 
  be 
  seen 
  

   hereafter, 
  do 
  not 
  correspond 
  with 
  what 
  is 
  shown 
  by 
  the 
  reports 
  of 
  the 
  

   Signal 
  Service 
  Bureau. 
  

  

  