ON Drosera rotundifolia 



condition attained 3 hours and 15 minutes after stimulation is 

 shown in e. 



Unbending commenced immediately. Table I shows that 

 this resulted from elongation of the concave side and contraction 

 of the convex side. The region of elongation is at first near the 

 base in Segment 7, which lies opposite the lower portion of Seg- 

 ment 6 on the convex side. This region gradually extends 

 apically. The contraction on the convex side is mostly confined 

 to the base, and it is moreover relatively slight, being only one 

 fourth the amount of elongation on the concave side. Fig. 2 

 shows the result of these alterations in length. Since the reaction 

 commences near the base, this portion is the first to straighten; 



" Fig. 2. Side views of the tentacle shown in Fig. i in the process of unljending. 

 X 22. a-e, successive stage in the expansion; /, the tentacle at the completion of 

 the reaction. 



as successive portions on the concave side further removed from 

 the base elongate, the straight part of the pedicel lengthens. In 

 unbending the tentacle is therefore curved in a different manner 

 than during bending. In the latter case, the principal curve is 

 near the base, in the former, nearer the apex. A comparison of 



