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 



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--, ii>». i \ I '-^v. V-. \ y VJ?^ I ILe^'iM^ 



'■•• '^ \A >^-N ^ '■•' ?•■''■ A yl^^S^'K 



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N. 



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Allogromia, 9|>., witli pseudop'xtial net and two diatom.s. (After Calkins.) 



