11/51 The varied and active chemical changes which are taking place cannot be observed. 1.Nucleus.2.Contractile vesicle. Nutritive vacuole containing a bacillus.] Up to the present it has been assumed that the environment of the amoeba is that to which it has become adapted and which is favorable to its existence. Under these conditions its structure conforms to the type of the species, as do also the phenomena which it exhibits, and it can assimilate food, grow and multiply. |