60r 



CO 



z 

 o 

 a: 

 o 



200 



Fig. 3. Growth responses of segments from roots grown in 2,3,5-truodobenzoic 

 acid solutions (5 x 10-" g/ml). (A)Total extension in 48 hrs. of normal (open 

 circle) and TIBA-grown (solid circle) segments. Response to lAA. Vertical Imes 

 indicate least significant difference (5 per cent) between means. B and C. Epidermal 

 cell length distribution before and after 48 hrs. of extension. (B) Normal segment 

 responses to lAA. (C) TIBA-grown segment responses to lAA. Open parallel lines- 

 segments immediately after excision. Blacked-in parallel lines— segments after 48 

 hrs. in 0.5 per cent sucrose solution. These lines are plotted at distance of <t/VN 

 above and below the respective mean of successive groups of cells. 



