PHYSIOLOGICAL ACTIVITIES OF THE PROTOZOA 75 



while its struggles furnish the stimulus for an accumulation of more 

 protoplasm about it, and this, armed with digestive fluids, soon kills 



Fig. 23 





• / A 







^' "^'^'^ \ '""^ v '\ ' '■■; ■'' \ !h c*^n ^t^'^f'/ f .^■- y 





r ;' 



Allogromia, sp., with pseudopodial net and two diatoms. (After Calkins.) 



