ELEMENTARY VITAL PHENOMENA 



153 



remain for a long time in the concavity which the sausage-shaped 

 nucleus turns toward the interior of the cell, there chiefly to 







y 





\°l 



ijsjg'-o'^';., 



,7 \l"^0-^^.»r . ^ - 









Fig. 51. — An elongated pseudupodiuni of Lkhirktiiutin in which an infusoriau (C'olpidititu colpoda) 

 has become caught : ", '', <■, <i, e, j, various stages of digestion of the infusorian. 



undergo destruction. This indicates that very probably the nucleus 

 takes an important share in the digestion of the food-masses. 

 Just as proteids are transformed by pepsin in an acid and by 



