GROWTH AND VARIABILITY IN HELIANTHUS 26 1 
tiles. In other words, the plants which were largest at maturity were 
superior all through the season. 
Changes in the Quartile Positions of the Plants during the 
Grand Period of Growth 
Reference has previously been made to certain tendencies of the plants 
in theyifferent quartiles either to alter or to maintain their relative positions 
during^ growth. Figures 2 and 3 showjgraphically the changes in relative 
S I I I I I I I I I II 
0 7 11 ^l l& 35 42. 'IS 56 65 70 77 M 
MumbcT oij daxjs 
Fig. 2. Curves showing changes in mean quartile positions of plants starting in the 
several quartiles. 
Plants starting in first quartile. 
" " " second " 
" " " third 
" " " fourth 
position at successive measurements, for the plants starting, and for those 
ending, in the various quartiles. 
It will be evident, in spite of the changes, that plants tend to stay in or 
near the quartile in which they start, especially after the middle of the 
grand period of growth. 
