The infusorian can be called potentially immortal, because of this method of reproduction.
In fact, the infusorian simply swallows whatever happens to hit his mouth.
Thus the plant, that seems to know two things, is twice as well off as the infusorian that knows only one.
So far as we can see, therefore, everything that the infusorian feels at all, feels to him exactly like everything else.
This has been shown by the careful experiments of Maupas, who had observed 215 generations of an infusorian without sexual union.
The exchange of life-elements between two individuals is well illustrated in the case of the infusorian Noctiluca.
Now the single-celled infusorian is in many respects comparable with the single-celled germ of the higher animals.