102 



MOLAR AGENTS AND PROTOPLASM 



[Cn. IV 



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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 VERWORN, '92.) 



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

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



Fia. 17. Actinosphserium Eichhornii, unirritated. Natural size about 0.5 mm. 



(From VERWORN, '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 ; 



