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  should 
  bo 
  accompanied 
  by 
  a 
  statement 
  from 
  the 
  nurseryman 
  to 
  the 
  

   effect 
  that 
  the 
  stock 
  sold 
  was 
  grown 
  on 
  the 
  premises 
  inspected, 
  

   giving 
  also 
  the 
  date 
  of 
  such 
  inspection 
  and 
  the 
  time 
  when 
  the 
  stock 
  

   was 
  taken 
  u[). 
  If 
  a 
  growing 
  season 
  or 
  any 
  part 
  of 
  such 
  a 
  season 
  has 
  

   intervened 
  between 
  these 
  dates, 
  the 
  value 
  of 
  the 
  certificate 
  is 
  thereby 
  

   impaired. 
  

  

  3. 
  The 
  nurseryman 
  should 
  fumigate 
  all 
  suspected 
  stock 
  with 
  hy- 
  

   drocyanic 
  acid 
  gas 
  before 
  sending 
  it 
  out. 
  This 
  is 
  a 
  simple, 
  con- 
  

   venient, 
  and 
  comparatively 
  inexpensive 
  process, 
  and 
  the 
  most 
  effective 
  

   known 
  means 
  of 
  securing 
  a 
  complete 
  destruction 
  of 
  living 
  insects, 
  in- 
  

   cluding 
  the 
  San 
  Jose 
  scale. 
  For 
  this 
  purpose 
  the 
  stock 
  may 
  be 
  piled 
  

   up 
  closely 
  and 
  covered 
  with 
  a 
  large 
  sheet, 
  beneath 
  which 
  the 
  gas 
  is 
  

   generated 
  by 
  putting 
  into 
  a 
  glazed 
  earthenware 
  vessel 
  first 
  three 
  

   ounces 
  of 
  water, 
  next 
  one 
  ounce 
  of 
  commercial 
  sulphuric 
  acid, 
  and 
  

   finally 
  one 
  ounce 
  of 
  fused 
  potassium 
  cyanide 
  (98 
  per 
  cent. 
  ) 
  The 
  vessel 
  

   should 
  then 
  be 
  placed 
  at 
  once 
  under 
  the 
  sheet 
  and 
  left 
  for 
  at 
  least 
  an 
  

   hour. 
  The 
  above 
  quantity 
  should 
  be 
  used 
  for 
  every 
  hundred 
  cubic 
  

   feet 
  of 
  space. 
  For 
  large 
  nurseries 
  permanent 
  provision 
  for 
  disinfec- 
  

   tion 
  may 
  profitably 
  be 
  made 
  in 
  the 
  form 
  of 
  a 
  small, 
  tight 
  building, 
  

   conveniently 
  arranged 
  for 
  the 
  reception 
  of 
  large 
  lots 
  of 
  stock, 
  and 
  for 
  

   the 
  introduction 
  and 
  removal 
  of 
  the 
  insecticide 
  ingredients. 
  

  

  A 
  cloudy 
  day 
  is 
  best 
  for 
  the 
  work 
  if 
  done 
  in 
  the 
  open 
  air. 
  or, 
  if 
  this 
  

   cannot 
  be 
  had, 
  the 
  stock 
  should 
  be 
  fumigated 
  after 
  sunset. 
  Dormant 
  

   nursery 
  stock 
  is 
  not 
  easily 
  affected 
  by 
  the 
  gas. 
  and 
  there 
  is 
  no 
  danger 
  

   to 
  exposed 
  roots. 
  Sulphuric 
  acid 
  and 
  the 
  potassium 
  cyanide 
  are 
  

   deadly 
  poisons, 
  and 
  the 
  greatest 
  care 
  should 
  be 
  taken 
  not 
  to 
  inhale 
  

   any 
  of 
  the 
  gas 
  emitted 
  by 
  the 
  mixture, 
  as 
  it 
  is 
  deadly 
  to 
  man 
  and 
  

   other 
  animals 
  as 
  well 
  as 
  to 
  insects. 
  

  

  4. 
  Where 
  the 
  above 
  fumigation 
  method 
  is 
  impracticable, 
  as 
  in 
  the 
  

   case 
  of 
  the 
  ordinary 
  purchaser, 
  reliance 
  may 
  be 
  placed 
  upon 
  thor- 
  

   oughly 
  saturating 
  the 
  surface 
  of 
  suspected 
  trees 
  and 
  shrubs 
  with 
  a 
  

   solution 
  of 
  whale-oil 
  soap, 
  two 
  pounds 
  to 
  the 
  gallon 
  of 
  hot 
  water. 
  

  

  5. 
  All 
  stock 
  sent 
  out 
  by 
  the 
  nurseryman 
  should 
  bear 
  the 
  name 
  of 
  

   the 
  nursery 
  and, 
  if 
  practicable, 
  a 
  copy 
  of 
  a 
  certificate 
  of 
  inspection 
  

   containing 
  the 
  information 
  mentioned 
  under 
  2. 
  

  

  6. 
  Examples 
  of 
  all 
  stock 
  suspected 
  to 
  bear 
  this 
  scale 
  should 
  be 
  

   sent 
  at 
  once 
  to 
  the 
  address 
  of 
  the 
  State 
  Entomologist, 
  at 
  Urbana, 
  111., 
  

   with 
  a 
  request 
  for 
  examination 
  and 
  report. 
  

  

  7. 
  Whenever 
  the 
  fact 
  is 
  estal)lished 
  that 
  any 
  trees 
  or 
  shrubs 
  

   planted 
  out 
  are 
  infested 
  by 
  this 
  scale, 
  all 
  such 
  fruit 
  plants 
  should 
  be 
  

   destroyed 
  by 
  fire 
  if 
  practicable. 
  The 
  loss 
  thus 
  incurred 
  will 
  com- 
  

   monly 
  be 
  trivial 
  compared 
  with 
  that 
  which 
  will 
  be 
  likely 
  to 
  follow 
  if 
  

   less 
  radical 
  measures 
  are 
  taken. 
  This 
  is 
  particularly 
  incumbent 
  

   upon 
  the 
  owner 
  when 
  the 
  scale 
  has 
  been 
  lately 
  introduced 
  and 
  is 
  as 
  

   yet 
  confined 
  to 
  a 
  small 
  number 
  of 
  trees, 
  especially 
  if 
  these 
  are 
  

   isolated. 
  

  

  8. 
  Wiien 
  such 
  destruction 
  is 
  impracticable, 
  the 
  infested 
  trees 
  or 
  

   bushes 
  should 
  be 
  trimmed 
  closely 
  in 
  fall, 
  after 
  the 
  leaves 
  have 
  

   dropped, 
  scraped 
  to 
  remove 
  loose 
  bark, 
  and 
  sprayed 
  very 
  thoroughly 
  

  

  