﻿Pagi 
  192 
  

  

  PLATE 
  XXXI 
  

  

  Arrangement 
  of 
  vessels 
  kept 
  inside 
  cage 
  for 
  reception 
  of 
  eggs 
  in 
  

   experiments 
  regarding 
  oviposition 
  in 
  Culicidae. 
  From 
  left 
  to 
  

   right 
  are 
  shown 
  (1) 
  water 
  kept 
  warm 
  by 
  supporting 
  the 
  water- 
  

   vessel 
  on 
  a 
  black 
  stiff 
  paper 
  roll 
  covering 
  an 
  electric 
  light 
  bulb, 
  

   (2) 
  water 
  kept 
  at 
  normal 
  temperature, 
  the 
  containing 
  vessel 
  

   supported 
  on 
  a 
  wooden 
  block 
  ; 
  (3) 
  water 
  kept 
  cool, 
  the 
  contain- 
  

   ing 
  vessel 
  embedded 
  in 
  a 
  pot 
  of 
  ice 
  and 
  sawdust. 
  

  

  ^ 
  

  

  