﻿194 
  

  

  PROCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAI- 
  MEETING 
  

  

  quite 
  independent 
  of 
  any 
  consideration 
  as 
  to 
  how 
  it 
  would 
  afEect 
  the 
  

   future 
  of 
  the 
  offspring. 
  

  

  In 
  the 
  taste 
  experiments 
  (Series 
  1) 
  (Plate 
  XXXII) 
  the 
  largest 
  

   number 
  of 
  eggs 
  was 
  laid 
  in 
  0-6 
  per 
  cent. 
  NaCl, 
  compared 
  with 
  which 
  

   those 
  laid 
  in 
  an 
  equimolecular 
  solution 
  of 
  sugar 
  were 
  very 
  few, 
  though 
  

   in 
  captivity 
  the 
  mosquitos' 
  liking 
  for 
  sugar 
  for 
  drinking 
  purposes 
  is 
  well 
  

   known. 
  It 
  would 
  appear 
  that 
  the 
  mosquito 
  prefers 
  a 
  salt 
  solution 
  of 
  

   low 
  strength 
  sometimes 
  even 
  to 
  distilled 
  water 
  (Culex 
  fatigans 
  seemed 
  to 
  

   prefer 
  sugar 
  to 
  NaCl). 
  In 
  judging 
  the 
  results 
  obtained 
  with 
  Ca 
  (011)2, 
  

   due 
  consideration 
  must 
  be 
  given 
  to 
  the 
  fact 
  that 
  the 
  substance, 
  when 
  

   exposed 
  to 
  atmosphere 
  readily 
  forms 
  CaCog, 
  in 
  which 
  condition 
  it 
  is 
  

   likely 
  to 
  exert 
  almost 
  a 
  neutral 
  effect. 
  Tannin 
  was 
  tried 
  in 
  order 
  to 
  

   find 
  out 
  whether 
  the 
  substance, 
  as 
  present 
  in 
  the 
  bark 
  or 
  tissues 
  of 
  

   trees, 
  imparts 
  any 
  property 
  {e.g., 
  taste 
  or 
  colour) 
  to 
  water 
  occurring 
  in 
  

   holes 
  trees 
  in 
  which 
  some 
  of 
  mosquitos 
  habitually 
  breed, 
  but 
  they 
  seem 
  

   positively 
  to 
  dislike 
  it. 
  

  

  In 
  Series 
  2 
  (Plate 
  XXXII) 
  the 
  effects 
  of 
  changing 
  the 
  acid 
  radicle 
  

   keeping 
  the 
  base 
  (Sodium 
  in 
  this 
  case) 
  constant 
  were 
  studied 
  and 
  the 
  

   results 
  obtained 
  with 
  equimolecular 
  solutions 
  of 
  these 
  substances 
  are 
  

   represented 
  in 
  the 
  curves. 
  In 
  the 
  same 
  series 
  are 
  included 
  results 
  

   obtained 
  with 
  different 
  percentages 
  of 
  NaCl. 
  

  

  Series 
  2{a) 
  (Plate 
  XXXIII) 
  gives 
  figures 
  obtained 
  with 
  varying 
  pre- 
  

   centages 
  of 
  NaCl. 
  As 
  wUl 
  be 
  seen 
  a 
  strength 
  considerably 
  below 
  1 
  per 
  

   cent, 
  is 
  always 
  preferred 
  by 
  them. 
  

  

  Series 
  2(&) 
  (Plate 
  XXXIII) 
  shows 
  the 
  comparative 
  effects 
  of 
  NaCl 
  

   and 
  KCl, 
  the 
  results 
  obtained 
  being, 
  as 
  will 
  be 
  seen, 
  very 
  anomalous. 
  

   It 
  would 
  be 
  useless 
  to 
  seek 
  for 
  an 
  explanation 
  before 
  further 
  experi- 
  

   ments 
  are 
  made 
  with 
  different 
  species 
  of 
  mosquitos. 
  

  

  The 
  results 
  obtained 
  with 
  certain 
  organic 
  acids 
  are 
  interesting 
  inas- 
  

   much 
  as 
  the 
  salts 
  always 
  appeared 
  better 
  than 
  their 
  corresponding 
  acids, 
  

   as 
  will 
  be 
  seen 
  in 
  the 
  following 
  statement 
  : 
  — 
  

  

  