184 
JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 
Each horizontal space is supposed to correspond to a centi¬ 
metre. The vertical spaces 1—7 correspond to the respective 
pots. The dots, circles, and asterisks represent the condition of 
the seedlings on February 16th; the lines, that in the duplicate 
set examined on March 3rd. The average total height of the 
seedlings (Mustard or Cress) is shown by black dots or thick 
lines respectively, the average height of the tigellum is shown 
by circles 0 or by thin lines, the average length of the radicle by 
asterisks * or by wavy lines. 
