d. "Dependence of attaching reaction in isolated tub* faet 



upon physiological state of organism, 

 . Attaching by only a part of the ambulacra! disk, 

 3* Releasing of attahment and withdrawal 

 a* Result of stimulation of side of column* 

 b. Response to st&sulation of the disk, 

 o. Detaching and withdrawal of isolated tube feet, 

 d* Detaching and withdrawal as a response to physiological 



conditions in the nervous system* 

 4* The step reflex* 



iJjW* 



a. Intergradations with drawing response* 

 1 Difference in extension 



2. Difference in withdrawing* 



b. Description of the step reflex 



0* Significance of extension^ during back sweep* 



d* Analysis of the contact stimulus which initiates the 



step reflex* 

 Analysis of the factors asrerning the orientation of 



the step reflex* 



1* Extension determined by "physiological an^terior* of 

 animal 



2* Lashing back determined either 



a* by location of contact stimulus or 



b* tho condition of relative excitability of the different 



parts of the longitudinal musculature* 

 statue of the attaching relfex during the step reflex and its 



modifications* 



g, Delation of the attaching reflex to the amount of resistance 

 to the step* 

 1* Methods of studying* 

 2, Numerical expression of this relationship Asterina 2*7 



