126 L. J. Audits ayid J. K. Baklish 



also want to emphasize that if we measure elongation for a period 

 of 15 hours we measure only initial and end result — we don't know 

 what is happening in between. We found as the basis of our assump- 

 tion of an adaptation, that the growth curve of the cells didn't 

 change in the way we had expected. I wonder if you could construct 

 such time curves from the frequency diagrams of your cells? 



Dr. Audus: No, with this technique it is impossible to do that. 

 It would be nice to think that one day one might be able to study 

 changes like the ones described without damaging or mechanically 

 affecting the cells in any way. In this excised segment technique, we 

 still don't know the traumatic effect involved. We have another 

 example before us in the split-pea segment tests, where the inner and 

 outer cells respond differently to auxins. We still don't know for 

 certain what causes this differential response. We know from the 

 work of Schneider that some of it at least is due to trauma; but 

 what are the interactions between trauma and indoleacetic acid 

 action? 



