SUMMARY: Spined and spineless forms of were obtained by growth in the presence and absence, respectively, of Washed suspensions of both forms engulfed all the bacteria tested although the spined form took them up 1·3 to 1·9 times more rapidly per unit volume of protozoon than did the spineless form. and were rapidly digested by the spined form after engulfment. Free amino acids were taken up on average 3·1 times and glucose approximately 60 times faster per unit volume of protozoon by the spined form. Limited amounts of protein were synthesized by the spined form from glucose and starch but engulfed bacteria and, to a lesser extent, free amino acids were probably the prinicpal sources of protein for growth of both forms.


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