102 



MOLAR AGENTS AND PROTOPLASM 



[Ch. IV 



u 



c. 



^ 



^ 



Fig. 16. — A series showing seven phases in the contraction of a pseudopodium of 

 Difflugia lobostoma, following total stimulation. The series passes from left 

 to right. (From "Vekwobn, '92.) 



pseudopodium and in the whole mass. The same thing is seen 

 in the widely dissimilar Actinospherium (Fig. 17). Here is 



Fig. 17. — Actinosphserium Eichhornli, unirritated. Natural size about 0.5 mm. 

 (From Verwoen, '89.) 



especially noticeable (Figs. 18, 19) the tendency to produce 

 fusiform or spherical aggregations, and to retract the pseudo- 

 podia. So, too, in the irritated stamen hairs of Tradescantia ; 



