﻿PBOCEEDINGS 
  OF 
  THE 
  FOURTH 
  ENTOMOLOGICAL 
  MEETING 
  

  

  243 
  

  

  pests 
  was 
  an 
  inevitable 
  evil 
  and 
  suggested 
  the 
  cumbersome 
  mechanical 
  

   method 
  of 
  cleaning 
  the 
  grain 
  by 
  sieves 
  and 
  hand- 
  winnows 
  (1). 
  

  

  Some 
  of 
  the 
  methods 
  mentioned 
  above 
  are 
  quite 
  reliable 
  so 
  far 
  as 
  

   the 
  destruction 
  of 
  insects 
  is 
  concerned, 
  but 
  are 
  liable 
  to 
  effect 
  the 
  ger- 
  

   minating 
  capacity 
  of 
  the 
  grain, 
  while 
  others, 
  which 
  might 
  be 
  effective 
  

   in 
  the 
  laboratory, 
  are 
  not 
  such 
  as 
  can 
  be 
  applied 
  on 
  a 
  large 
  scale, 
  for 
  

   example 
  at 
  the 
  elevator 
  at 
  Lyallpur. 
  

  

  The 
  elevator 
  at 
  Lyallpur 
  is 
  a 
  huge 
  building 
  about 
  60 
  feet 
  high 
  and 
  

   consists 
  of 
  32 
  bins, 
  having 
  a 
  total 
  capacity 
  for 
  storing 
  100,240 
  maunds 
  

   of 
  wheat 
  (for 
  particulars 
  of 
  these 
  bins 
  see 
  the 
  plan 
  and 
  the 
  table 
  attached). 
  

  

  The 
  bins 
  are 
  of 
  three 
  types 
  {i) 
  Hexagonal 
  bins, 
  which 
  are 
  the 
  biggest. 
  

   There 
  are 
  sixteen 
  bins 
  of 
  this 
  type, 
  {ii) 
  Quarter 
  bins. 
  Each 
  of 
  these 
  

   bins 
  is 
  a 
  quarter 
  of 
  the 
  hexagonal 
  bins 
  of 
  the 
  first 
  type. 
  There 
  are 
  

   ten 
  bins 
  of 
  this 
  type, 
  (m) 
  Kectangular 
  bins, 
  which 
  are 
  the 
  smallest 
  

   of 
  all, 
  each 
  being 
  rectangular 
  in 
  outline. 
  Of 
  this 
  shape 
  there 
  are 
  six 
  

   bins. 
  

  

  Each 
  of 
  the 
  32 
  bins 
  is 
  about 
  50 
  feet 
  deep 
  with 
  a 
  small 
  manhole 
  at 
  

   the 
  top 
  for 
  running 
  in 
  the 
  grain 
  and 
  a 
  conical 
  outlet 
  at 
  the 
  bottom 
  for 
  

   running 
  out 
  the 
  grain. 
  

  

  Plan 
  of 
  bins 
  at 
  the 
  elevator, 
  Lyallpur, 
  showing 
  the 
  shape 
  and 
  arrange- 
  

   ment 
  of 
  bins 
  in 
  transverse 
  section. 
  (See 
  Plate 
  XLI, 
  fig. 
  2). 
  

  

  Table 
  showing 
  the 
  exact 
  dimensions, 
  grain 
  capacity, 
  etc., 
  of 
  the 
  

   bins. 
  

  

  During 
  1920 
  the 
  elevator 
  was 
  used 
  for 
  the 
  first 
  time 
  and 
  after 
  a 
  

   few 
  months 
  complaints 
  of 
  insect 
  attack 
  were 
  received 
  and 
  accordingly 
  

   the 
  Entomological 
  Section 
  was 
  asked 
  to 
  deal 
  with 
  the 
  problem. 
  It 
  

   was 
  found 
  that 
  the 
  insects 
  infesting 
  the 
  wheat 
  were 
  Trogoderma 
  JcJiapra 
  

   at 
  the 
  top 
  and 
  Rhizopertha 
  dominica 
  at 
  the 
  bottom 
  of 
  the 
  bins. 
  The 
  

   temperature 
  records 
  of 
  the 
  bins 
  shewed 
  that 
  the 
  temperature 
  in 
  those 
  

  

  