﻿PROCEEDINGS 
  OF 
  THE 
  FOFRTH 
  ENTOMOLOGICAL 
  MEETING 
  

  

  195 
  

  

  Concurrently 
  with 
  the 
  preceding 
  series 
  of 
  experiments 
  with 
  0-5 
  per 
  

   cent, 
  organic 
  acids 
  another 
  series 
  of 
  observations 
  was 
  made 
  on 
  the 
  effects 
  

   of 
  certain 
  inorganic 
  acids 
  (against 
  an 
  alkali) 
  the 
  result 
  being 
  as 
  follows 
  : 
  — 
  

  

  Chemical. 
  

  

  H2 
  SO4 
  1 
  per 
  cent 
  

  

  0-5 
  per 
  cent 
  

  

  HCL. 
  1 
  per 
  cent. 
  

  

  0-5 
  per 
  cent. 
  

  

  Boric 
  Acid 
  (? 
  0-5 
  per 
  cent.) 
  

  

  H, 
  . 
  

  

  Number 
  of 
  eggs 
  

  

  laid 
  by 
  Stegomyia 
  

  

  albopicta. 
  

  

  Number 
  of 
  egg- 
  

   masses 
  laid 
  by 
  

   Culex 
  fatigana. 
  

  

  Series 
  5 
  (Plate 
  XXXIV) 
  shows 
  the 
  comparative 
  effects 
  of 
  certain 
  

   well-known 
  disinfectants 
  and 
  therefore 
  the 
  practical 
  value 
  of 
  these 
  

   figures 
  is 
  obvious. 
  The 
  inclusion 
  of 
  Malachite 
  green 
  was 
  suggested 
  by 
  

   its 
  colour 
  which 
  could 
  be 
  conveniently 
  tried 
  against 
  the 
  red 
  of 
  KMnO^. 
  

   As 
  was 
  expected, 
  mosquitos 
  showed 
  a 
  distinct 
  preference 
  for 
  green 
  

   over 
  red, 
  but 
  it 
  is 
  interesting 
  to 
  note 
  that 
  they 
  preferred 
  the 
  lower 
  of 
  

   the 
  two 
  intensities. 
  In 
  connection 
  with 
  the 
  figures 
  obtained 
  with 
  HgCla 
  

   it 
  may 
  l)e 
  noted 
  that 
  in 
  another 
  paper 
  by 
  one 
  of 
  the 
  present 
  writers 
  it 
  

   has 
  been 
  shown 
  that 
  0-001 
  per 
  cent. 
  HgClg 
  has 
  hardly 
  any 
  deleterious 
  

   effect 
  on 
  mosquito 
  larvae,* 
  and 
  as 
  such, 
  the 
  fact 
  that 
  they 
  oviposited 
  

   in 
  corrosive 
  sublimate 
  does 
  not 
  conclusively 
  prove 
  their 
  indifference 
  to 
  

   a 
  poisonous 
  substance 
  during 
  oviposition. 
  

  

  Series 
  6 
  (Plate 
  XXXIV) 
  represents 
  results 
  obtained 
  with 
  certain 
  

   vegetable 
  products. 
  Mannite 
  is 
  the 
  sweetish 
  crystalline 
  compound 
  oc- 
  

   curring 
  in 
  celery, 
  sea-grasses, 
  etc., 
  and 
  asparagin 
  occurs 
  in 
  asparagus. 
  

   As 
  will 
  be 
  noticed 
  the 
  subtsances 
  have 
  been 
  selected, 
  to 
  some 
  extent, 
  

   with 
  reference 
  to 
  their 
  position 
  in 
  the 
  system 
  of 
  organic 
  compounds, 
  the 
  

   citrate 
  and 
  the 
  bitartrate 
  being 
  both 
  oxidation 
  products 
  of 
  glycols, 
  and 
  

   asparagin 
  being 
  the 
  amide 
  of 
  aspartic 
  acid, 
  which 
  on 
  treatment 
  with 
  

   nitrous 
  acid 
  produces 
  malic 
  acid, 
  another 
  oxidation 
  product 
  of 
  glycol. 
  

   The 
  partiality 
  shown 
  to 
  Sodium 
  citrate 
  even 
  in 
  preference 
  to 
  water 
  is 
  

   borne 
  out 
  by 
  the 
  observations 
  recorded 
  in 
  a 
  previous 
  series. 
  But 
  the 
  

   figures 
  obtained 
  with 
  0-5 
  per 
  cent. 
  NaCl 
  are 
  unexpectedly 
  meagre. 
  

  

  * 
  A 
  note 
  on 
  the 
  effects 
  of 
  Mercurous 
  Chloride 
  on 
  Culicid 
  larvfe, 
  by 
  S. 
  K. 
  Sen, 
  

  

  