﻿546 
  

  

  Analyses 
  of 
  materials 
  sold 
  as 
  insecticides 
  and 
  fungicides. 
  — 
  New 
  York 
  

   Agric. 
  Expt. 
  Sta., 
  Geneva, 
  N.Y., 
  Bull. 
  384, 
  April 
  1914, 
  20 
  pp. 
  

  

  These 
  tables 
  give 
  the 
  guaranteed 
  percentage 
  of 
  the 
  active 
  principle 
  

   and 
  the 
  percentage 
  actually 
  found 
  in 
  the 
  various 
  brands 
  tested 
  from 
  

   samples 
  taken 
  in 
  stated 
  localities. 
  As 
  a 
  general 
  rule, 
  the 
  guarantee 
  

   was 
  materially 
  exceeded, 
  only 
  in 
  a 
  few 
  cases 
  did 
  the 
  contrary 
  obtain, 
  

   and 
  then 
  but 
  to 
  a 
  slight 
  extent. 
  The 
  following 
  figures 
  are 
  those 
  

   actually 
  found 
  on 
  analysis 
  : 
  — 
  In 
  Paris 
  green 
  the 
  percentage 
  of 
  arseni- 
  

   ous 
  oxide 
  varied 
  from 
  56" 
  12 
  to 
  57*19 
  ; 
  that 
  of 
  copper 
  oxide 
  from 
  

   29' 
  06 
  to 
  30' 
  84 
  ; 
  that 
  of 
  water-soluble 
  arsenious 
  oxide 
  fronii 
  3-09 
  to 
  

   8*39. 
  In 
  lead 
  arsenate 
  the 
  arsenic 
  oxide 
  varied 
  from 
  11*71 
  to 
  18*89 
  

   per 
  cent., 
  and 
  (in 
  the 
  case 
  of 
  dry 
  lead 
  arsenate) 
  from 
  22 
  to 
  31 
  per 
  

   cent. 
  ; 
  the 
  lead 
  oxide 
  from 
  30*59 
  to 
  44*89 
  per 
  cent, 
  and 
  from 
  43*74 
  

   to 
  64*40 
  per 
  cent. 
  ; 
  the 
  water-soluble 
  arsenic 
  from 
  0*24 
  to 
  1*35 
  per 
  

   cent, 
  and 
  from 
  0*29 
  to 
  1*57 
  per 
  cent. 
  In 
  a 
  Bordeaux-Paris 
  green 
  

   mixture 
  the 
  percentage 
  of 
  copper 
  was 
  4.87 
  and 
  that 
  of 
  arsenious 
  

   oxide 
  0*22 
  per 
  cent. 
  ; 
  whilst 
  in 
  a 
  mixture 
  of 
  Bordeaux 
  (dry) 
  and 
  

   Paris 
  green 
  these 
  figures 
  were 
  19*22 
  and 
  16*48 
  respectively. 
  In 
  

   Bordeaux 
  and 
  lead 
  arsenate 
  mixture 
  the 
  percentage 
  of 
  arsenic 
  oxide 
  

   varied 
  from 
  1*30 
  to 
  13*27 
  per 
  cent. 
  ; 
  that 
  of 
  lead 
  oxide 
  from. 
  2*73 
  

   to 
  26*23 
  ; 
  that 
  of 
  copper 
  from 
  1*77 
  to 
  5*65 
  per 
  cent. 
  ; 
  and 
  that 
  of 
  

   water-soluble 
  arsenic 
  oxide 
  from 
  0*11 
  to 
  0*43 
  per 
  cent. 
  In 
  hme- 
  

   sulphur 
  solution 
  the 
  percentage 
  of 
  sulphur 
  in 
  solution 
  varied 
  from 
  

   13 
  to 
  26*34 
  per 
  cent. 
  ; 
  the 
  density 
  ranging 
  from 
  21*6 
  to 
  36*5 
  degrees 
  

   Beaume. 
  In 
  soluble 
  sulphur 
  compounds 
  the 
  soluble 
  sulphur 
  present 
  

   varied 
  from 
  58 
  to 
  58*42 
  per 
  cent. 
  In 
  mixtures 
  of 
  soluble 
  sulphur 
  and 
  

   oils 
  the 
  amount 
  of 
  soluble 
  sulphur 
  varied 
  from 
  4*95 
  to 
  31*81 
  per 
  cent. 
  

   In 
  nicotin 
  preparations 
  the 
  percentages 
  of 
  nicotin 
  varied 
  from 
  0*89 
  

   to 
  44*94 
  per 
  cent. 
  A 
  table 
  of 
  soap 
  emulsions 
  is 
  given, 
  and 
  in 
  one 
  of 
  

   hellebore 
  the 
  percentages 
  of 
  ash 
  range 
  from 
  9*63 
  to 
  21*45 
  per 
  cent. 
  

   In 
  a 
  table 
  of 
  miscellaneous 
  materials 
  and 
  mixtures 
  the 
  principal 
  

   features 
  of 
  these 
  compounds 
  are 
  mentioned. 
  

  

  Smith 
  (G. 
  R.). 
  Distintos 
  m6todos 
  para 
  la 
  destrucci6n 
  de 
  los 
  insectos. 
  

  

  [Various 
  methods 
  of 
  insect 
  destruction.] 
  — 
  Bol. 
  Mimst. 
  Agric, 
  

   Buenos 
  Aires, 
  xvii, 
  nos. 
  3 
  & 
  4, 
  March 
  & 
  April 
  1914, 
  

   pp. 
  342-363, 
  8 
  figs., 
  2 
  tables. 
  

  

  This 
  paper 
  gives 
  a 
  popular 
  and 
  general 
  account 
  of 
  the 
  several 
  

   methods 
  of 
  insect 
  control 
  now 
  practised. 
  The 
  principal 
  insecticides 
  

   are 
  described, 
  and 
  various 
  common 
  pests, 
  their 
  injury 
  and 
  control, 
  are 
  

   tabulated. 
  

  

  Lustnek(G.). 
  Die 
  Nahrung 
  des 
  Ohrwurmes 
  {Forficula 
  aiiricularia,L.) 
  

   nach 
  dem 
  Inhalt 
  seines 
  Kropf 
  es. 
  [The 
  food 
  of 
  the 
  earwig 
  as 
  shown 
  

   by 
  the 
  contents 
  of 
  its 
  crop.] 
  — 
  Centralblt. 
  Bakt. 
  Parasit. 
  & 
  Infek- 
  

   tionskrankheiten, 
  Jena, 
  xl, 
  nos. 
  19-21, 
  4th 
  April 
  1914, 
  pp. 
  482-514. 
  

  

  As 
  the 
  earwig 
  is 
  a 
  night-feeder 
  it 
  is 
  difficult 
  to 
  ascertain 
  its 
  food- 
  

   material 
  by 
  observations 
  in 
  the 
  open, 
  whilst 
  the 
  numerous 
  laboratory 
  

   experiments 
  on 
  the 
  subject 
  have 
  always 
  been 
  subjectively 
  influenced 
  

   by 
  the 
  insect's 
  choice 
  being 
  limited 
  to 
  the 
  material 
  provided. 
  The 
  

   results 
  obtained 
  by 
  over 
  30 
  workers 
  are 
  summarised 
  by 
  the 
  author, 
  

   who 
  points 
  out 
  that 
  the 
  uncertainty 
  has 
  increased 
  with 
  the 
  number 
  

   of 
  tests. 
  To 
  determine 
  the 
  food 
  of 
  the 
  earwig 
  it 
  is 
  necessary 
  to 
  

  

  