-19- 



forward and the curve 2-3 meaouros the amount of increased pull that 

 the starfish was able to resist before releasing (at 3). 



The values for 12 observation on Asterim are as follows!: 



Strength of pull 

 (2 on fig.) 



2 g 

 3 



5 

 6 

 9 



12 



18 



18 18 



18 



27 



33 



Releases 

 at (3 on fig.) 



15 g 



15 



27 



21 



24 



36 



45 



3/2 



7.5 



5 



5.5 



3.5 



2.6 



3 



57 

 60 

 66 

 84 



54 aT 



2.5 

 2.5 



Disregarding the high values of the first three observations 

 due observably to the fact that certain of the tube feet were "re- 

 fractory", -that is, had not become coordinated in the step reflex and 

 wers simply attaching, -79 find that the strength of attachment of a 

 tube foot is on the average 2.7 times the amount of pulling the tubs 

 foot is doing at that time (amount of resistance to the step). That is 

 to say, the tube feat are attached strongly enough to resist a pull 

 ab-n.t 2.7 times as graat as that to which they actually are subjecting 

 themselves; a facto? of safety against skidding on the smoothest surface 

 of 2,7. The valu* of friction in the above experiment was tested with 

 the starfish inverted and found to be negligible (about 3 g). 



'Whether the relation (quotient 3/2) between the t-/o variables 

 is constant, logarithmic or of some othar nature can be told only 

 after much statistical compilation of data. In Ajtarina it seams to 



