﻿for 
  destroying 
  Mould 
  on 
  Insects. 
  - 
  21 
  

  

  When 
  required, 
  fill 
  the 
  pan 
  (B), 
  (not 
  more 
  than 
  half-full 
  of 
  spirits 
  

   of 
  wine 
  (see 
  the 
  dotted 
  line 
  8), 
  otherwise 
  it 
  might 
  boil 
  over,) 
  and 
  

   drop 
  it 
  into 
  the 
  aperture 
  (2); 
  then 
  light 
  the 
  lamp, 
  and 
  place 
  it 
  

   upon 
  as 
  many 
  of 
  the 
  blocks 
  as 
  will 
  raise 
  it 
  sufficiently 
  for 
  the 
  flame 
  

   to 
  heat 
  the 
  spirit. 
  As 
  soon 
  as 
  it 
  boils, 
  take 
  the 
  drawer 
  of 
  insects, 
  

   reverse 
  it, 
  and 
  place 
  it 
  upon 
  the 
  frame, 
  over 
  the 
  pan, 
  from 
  which 
  

   the 
  vapour 
  is 
  arising, 
  keeping 
  it 
  close 
  down 
  for 
  one, 
  two 
  or 
  three 
  

   minutes, 
  according 
  to 
  the 
  size 
  of 
  the 
  insects, 
  when 
  the 
  mould 
  will 
  

   have 
  vanished 
  : 
  then 
  hold 
  the 
  drawer 
  before 
  a 
  brisk 
  fire, 
  or 
  place 
  

   it 
  in 
  the 
  sun 
  for 
  a 
  short 
  time, 
  and 
  the 
  operation 
  is 
  terminated. 
  

   Where 
  many 
  drawers 
  are 
  to 
  be 
  cleansed, 
  as 
  soon 
  as 
  one 
  is 
  taken 
  

   off 
  the 
  stool 
  to 
  be 
  dried, 
  another 
  may 
  be 
  placed 
  over 
  the 
  bath, 
  and 
  

   thus 
  a 
  dozen 
  may 
  be 
  done 
  in 
  half-an-hour. 
  Great 
  care 
  must 
  be 
  

   taken 
  not 
  to 
  let 
  the 
  spirits 
  boil 
  over, 
  which 
  is 
  scarcely 
  possible 
  if 
  

   the 
  pan 
  be 
  only 
  half-filled 
  ; 
  and 
  the 
  raised 
  edges 
  of 
  the 
  rim 
  not 
  only 
  

   strengthen 
  the 
  pan, 
  but 
  prevent 
  any 
  spirits 
  from 
  running 
  over. 
  If 
  

   a 
  lid 
  be 
  placed 
  over 
  the 
  pan, 
  it 
  will 
  very 
  soon 
  boil, 
  when 
  of 
  course 
  

   it 
  must 
  be 
  removed. 
  

  

  There 
  is 
  another 
  advantage 
  by 
  this 
  process. 
  All 
  mites 
  and 
  de- 
  

   structive 
  larvae 
  of 
  insects 
  are 
  instantly 
  annihilated, 
  without 
  the 
  

   slightest 
  injury 
  to 
  the 
  collection. 
  

  

  Dr. 
  Chavannes, 
  of 
  Lausanne, 
  tells 
  me 
  he 
  purifies 
  his 
  collections, 
  

   when 
  infested 
  by 
  destructive 
  insects, 
  by 
  admitting 
  into 
  his 
  boxes 
  

   sulphuretted 
  hydrogen, 
  but 
  that 
  is 
  an 
  operation 
  which 
  it 
  would 
  not 
  

   be 
  safe 
  to 
  entrust 
  to 
  any 
  persons 
  who 
  are 
  not 
  accustomed 
  to 
  che- 
  

   mical 
  experiments. 
  

  

  EXPLANATION 
  OF 
  THE 
  PLATE. 
  (IM. 
  IL) 
  

   Fig. 
  A. 
  A 
  4-legged 
  stool 
  drawn 
  in 
  perspective. 
  

  

  1. 
  The 
  top. 
  

  

  2. 
  A 
  circular 
  hole. 
  

  

  3. 
  A 
  raised 
  square 
  frame. 
  

  

  4. 
  A 
  spline 
  or 
  bead 
  to 
  confine 
  the 
  drawer 
  and 
  keep 
  it 
  in 
  its 
  place 
  

  

  duritig 
  the 
  operation.* 
  

  

  6. 
  A 
  lamp. 
  

  

  7. 
  Three 
  small 
  blocks 
  of 
  wood. 
  

  

  B. 
  The 
  pan 
  of 
  block-tin. 
  

  

  5. 
  The 
  rim, 
  with 
  raised 
  edges. 
  

  

  8. 
  Level 
  of 
  the 
  alcohol. 
  

  

  C. 
  Diagram 
  to 
  show 
  nearly 
  the 
  relative 
  proportions 
  of 
  the 
  top 
  of 
  the 
  

  

  stool 
  J 
  the 
  figures 
  according 
  with 
  those 
  employed 
  in 
  Fig. 
  A. 
  

  

  * 
  When 
  smaller 
  drawers 
  or 
  boxes 
  are 
  to 
  be 
  purified, 
  a 
  smaller 
  frame 
  may 
  be 
  

   placed 
  inside 
  of 
  fig. 
  3 
  for 
  them 
  to 
  rest 
  upon, 
  so 
  that 
  no 
  vapour 
  may 
  escape; 
  and 
  

   as 
  this 
  is 
  a 
  sketch 
  of 
  M. 
  Ghiliani's 
  first 
  idea, 
  many 
  other 
  improvements 
  may 
  suggest 
  

   themselves 
  to 
  those 
  who 
  employ 
  the 
  apparatus. 
  

  

  