﻿196 
  History 
  of 
  Durham. 
  

  

  are 
  exceeding!}' 
  small, 
  an 
  ounce 
  containing 
  about 
  340,000 
  

   seeds. 
  One 
  large, 
  well-developed 
  tobacco 
  plant 
  will 
  produce 
  

   seed 
  enough 
  to 
  grow 
  plants 
  to 
  set 
  10 
  acres 
  certain!}'-, 
  and, 
  

   should 
  all 
  of 
  them 
  germinate 
  and 
  grow, 
  enough 
  to 
  set 
  out 
  

   100 
  acres. 
  Crowded 
  plants 
  must 
  struggle 
  for 
  existence, 
  are 
  

   never 
  strong 
  and 
  vigorous, 
  and 
  bear 
  transplanting 
  badly; 
  

   those 
  that 
  have 
  room 
  enough 
  to 
  grow 
  thriftily 
  will 
  have 
  a 
  

   thick 
  tuft 
  of 
  roots, 
  a 
  low, 
  stocky 
  top, 
  and 
  a 
  vigorous 
  consti- 
  

   tution, 
  growing 
  off 
  quickly 
  when 
  transplanted. 
  It 
  is 
  far 
  

   better 
  economy 
  to 
  increase 
  the 
  size 
  of 
  the 
  bed 
  than 
  to 
  at- 
  

   tempt 
  to 
  produce 
  a 
  large 
  number 
  of 
  plants 
  by 
  .thick 
  seeding. 
  

   A 
  btd 
  of 
  100 
  square 
  yards 
  will 
  usually 
  furnish 
  plants 
  

   enough 
  to 
  set 
  6 
  or 
  7 
  acress; 
  sometimes 
  a 
  bed 
  of 
  this 
  size 
  

   will 
  produce 
  enough 
  to 
  set 
  10 
  acres. 
  No 
  tobacco-grower 
  

   ever 
  regrets 
  having 
  a 
  surplus 
  of 
  plants, 
  for 
  in 
  that 
  case 
  he 
  

   can 
  select 
  the 
  best 
  and 
  set 
  out 
  his 
  whole 
  crop 
  early. 
  On 
  

   new 
  land 
  very 
  small 
  plants 
  may 
  be 
  set, 
  and 
  at 
  any 
  time 
  

   immediately 
  after 
  the 
  late 
  frosts 
  without 
  risk. 
  For 
  old 
  

   lands 
  j)lants 
  should 
  be 
  a 
  little 
  more 
  advanced 
  than 
  such 
  as 
  

   can 
  be 
  safely 
  planted 
  upon 
  new 
  lands, 
  but 
  as 
  the 
  season 
  

   advances 
  larger 
  plants 
  are 
  required 
  for 
  both 
  old 
  and 
  new 
  

   lands. 
  

  

  INSECT 
  ENEMIES 
  OF 
  THE 
  TOBACCO 
  PLANT. 
  

  

  From 
  the 
  first 
  appearance 
  of 
  the 
  minute 
  seed-leaves 
  in 
  

   the 
  plant-bed 
  until 
  the 
  tobacco 
  is 
  cut 
  and 
  hung 
  in 
  the 
  barn 
  

   the 
  patience 
  and 
  watchfulness 
  of 
  the 
  farmer 
  are 
  taxed 
  to 
  

   guard 
  against 
  the 
  depredations 
  of 
  insects. 
  

  

  Among 
  the 
  earliest 
  to 
  appear, 
  often 
  attacking 
  the 
  plants 
  

   and 
  destroying 
  them 
  so 
  early 
  as 
  to 
  make 
  the 
  planter 
  doubt 
  

   w^iether 
  the 
  seed 
  had 
  even 
  germinated, 
  are 
  the 
  " 
  garden 
  

   fleas," 
  sometimes 
  called 
  "snow 
  fleas" 
  and 
  "spring-tails" 
  

   {SmyniJLU7ms 
  hortensis). 
  When 
  viewed 
  from 
  the 
  upper 
  side 
  

   (dorsal 
  view), 
  the 
  most 
  conspicuous 
  divisions 
  are 
  a 
  large 
  

   head 
  and 
  an 
  abdomen 
  perfectly 
  smooth 
  and 
  plump, 
  without 
  

   any 
  segmental 
  cross 
  lines. 
  The 
  thorax 
  seems 
  confluent 
  

   with 
  the 
  abdomen. 
  Beneath 
  are 
  some 
  transverse 
  wrinkles, 
  

   indicating 
  segmental 
  divisions. 
  The 
  antennee 
  are 
  three- 
  

   fourths 
  as 
  long 
  as 
  the 
  body, 
  elbowed 
  about 
  the 
  middle, 
  and 
  

   are 
  composed 
  of 
  nine 
  joints, 
  six 
  very 
  short 
  and 
  three 
  very 
  

   long. 
  Projecting 
  from 
  the 
  posterior 
  of 
  the 
  abdomen 
  is 
  a 
  

   cone-shaped 
  process, 
  composed 
  of 
  three 
  distinctly 
  marked 
  

  

  