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  justify 
  hopes 
  that 
  an 
  extra 
  IJ 
  inch 
  in 
  the 
  spark-gap 
  would 
  be 
  more 
  

   satisfactory. 
  The 
  three 
  remaining 
  experiments 
  were 
  as 
  follows: 
  (1) 
  

   A 
  few 
  larvae 
  were 
  picked 
  out 
  and 
  subjected 
  to 
  a 
  shower 
  of 
  sparks 
  

   about 
  4 
  inches 
  in 
  length 
  ; 
  (2) 
  a 
  number 
  of 
  " 
  double 
  " 
  seeds 
  were 
  

   treated 
  in 
  the 
  same 
  way 
  ; 
  (3) 
  a 
  sheet 
  of 
  white 
  paper 
  was 
  laid 
  on 
  the 
  

   metal 
  plate 
  and 
  the 
  positions 
  of 
  20 
  seeds 
  marked 
  on 
  it 
  as 
  carefully 
  

   as 
  possible 
  ; 
  a 
  shower 
  of 
  sparks 
  was 
  then 
  passed 
  between 
  the 
  brush 
  

   and 
  the 
  plate. 
  The 
  results 
  of 
  these 
  three 
  experiments 
  support 
  those 
  

   of 
  the 
  former 
  five. 
  Every 
  larva 
  that 
  was 
  struck 
  by 
  a 
  spark 
  in 
  

   Experiment 
  No. 
  1 
  was 
  killed 
  by 
  it, 
  the 
  spark 
  piercing 
  its 
  skin 
  and 
  

   causing 
  bleeding 
  ; 
  but 
  on 
  the 
  other 
  hand, 
  not 
  a 
  single 
  larva 
  killed 
  

   by 
  a 
  spark 
  could 
  be 
  found 
  in 
  the 
  seeds 
  from 
  Experiment 
  No. 
  2. 
  A 
  

   diagram 
  showing 
  the 
  position 
  of 
  the 
  seeds 
  and 
  of 
  the 
  holes 
  pierced 
  by 
  

   sparks 
  in 
  Experiment 
  No. 
  3 
  is 
  given 
  and 
  demonstrates 
  that 
  only 
  in 
  one 
  

   instance, 
  that 
  of 
  a 
  *' 
  double 
  " 
  seed, 
  had 
  a 
  spark 
  traversed 
  any 
  of 
  the 
  

   spaces 
  marked 
  out 
  as 
  being 
  covered 
  by 
  the 
  seeds. 
  This 
  shows 
  fairly 
  

   conclusively 
  that 
  it 
  is 
  quite 
  impossible 
  to 
  " 
  make 
  sure 
  that 
  a 
  spark 
  

   passes 
  through 
  each 
  seed," 
  as 
  was 
  suggested, 
  without 
  an 
  excessive 
  

   waste 
  of 
  time 
  and 
  electric 
  current. 
  

  

  Storey 
  (G.). 
  Seasonal 
  variation 
  in 
  the 
  Common 
  Boll 
  Worm 
  (Earias 
  

   insulana, 
  Boisd.) 
  — 
  Agric. 
  Jl. 
  of 
  Egypt, 
  Cairo, 
  iii 
  (1913), 
  no. 
  2, 
  

   1914, 
  pp. 
  99-102, 
  1 
  pi., 
  1 
  chart. 
  

  

  The 
  variabiUty 
  of 
  the 
  adult 
  boll 
  worm 
  is 
  shown 
  by 
  the 
  fact 
  that 
  it 
  

   has 
  been 
  described 
  as 
  no 
  less 
  than 
  nine 
  distinct 
  species, 
  as 
  follows 
  : 
  

   insulana, 
  Boisd. 
  ; 
  smaragdinana, 
  Z. 
  ; 
  siliquana, 
  H.-S. 
  ; 
  frondosana, 
  

   Walk. 
  ; 
  xanthophila, 
  Walk. 
  ; 
  simillima. 
  Walk. 
  ; 
  chlorion, 
  Rmb. 
  ; 
  

   gossypii, 
  Frauenf. 
  ; 
  tristigosa, 
  Butl. 
  Sixteen 
  specimens 
  which 
  illus- 
  

   trate 
  the 
  natural 
  variation 
  of 
  the 
  species 
  are 
  depicted 
  in 
  a 
  coloured 
  

   plate, 
  two 
  being 
  close 
  approximations 
  to 
  the 
  type 
  form 
  insulana. 
  

   In 
  addition 
  to 
  these, 
  three 
  other 
  forms 
  which 
  occur 
  in 
  Egypt 
  have 
  

   received 
  varietal 
  names 
  : 
  ab. 
  anthophilana, 
  Snell., 
  ab. 
  ochreimargo, 
  

   Warren, 
  and 
  ab. 
  semifascia, 
  Warren. 
  These 
  names 
  may 
  be 
  used 
  in 
  

   a 
  loose 
  sense 
  for 
  the 
  sake 
  of 
  convenience. 
  Dr. 
  Gough's 
  observations 
  

   led 
  him 
  to 
  beheve 
  that 
  the 
  variation 
  was 
  very 
  largely 
  due 
  to 
  climatic 
  

   and 
  seasonal 
  conditions 
  and 
  at 
  his 
  suggestion 
  the 
  author 
  arranged 
  

   the 
  very 
  long 
  series 
  of 
  moths 
  in 
  the 
  Ministry's 
  collection 
  according 
  to 
  

   the 
  dates 
  on 
  which 
  they 
  emerged 
  from 
  the 
  pupa 
  or 
  were 
  captured. 
  

   The 
  seasonal 
  nature 
  of 
  the 
  variation 
  at 
  once 
  became 
  apparent. 
  The 
  

   pure 
  green 
  type 
  is 
  the 
  normal 
  summer 
  form 
  ; 
  while 
  during 
  the 
  winter, 
  

   the 
  predominant 
  form 
  is 
  ab. 
  anthophilana, 
  which 
  is 
  of 
  a 
  uniform 
  

   yellowish 
  tint 
  — 
  sometimes 
  orange— 
  except 
  for 
  some 
  narrow 
  dark 
  

   lines 
  across 
  the 
  wing. 
  

  

  GouGH 
  (L. 
  H.). 
  Entomological 
  Notes. 
  — 
  Agric. 
  Jl. 
  of 
  Egypt, 
  Cairo, 
  iii 
  

   (1913), 
  no. 
  2, 
  1914, 
  pp. 
  103-106, 
  1 
  pi. 
  

  

  A 
  parasite 
  of 
  the 
  Pink 
  Boll 
  Worm, 
  Pirnpla 
  roborator, 
  Fabr., 
  is 
  

   fairly 
  common 
  near 
  Cairo, 
  and, 
  accepting 
  the 
  theory 
  that 
  Gelechia 
  

   gossypiella, 
  Saund., 
  is 
  a 
  recent 
  introduction 
  into 
  Egypt, 
  it 
  must 
  be 
  

   supposed 
  that 
  this 
  Pimpla 
  has 
  recently 
  taken 
  to 
  preying 
  on 
  Gelechia 
  

   larvae. 
  The 
  larvae 
  are 
  known 
  to 
  feed 
  externally 
  on 
  a 
  great 
  variety 
  

  

  