The amoeba slowly moves along the surface of the glass by the extension of blunt processes formed from the clear outer portion which adhere to the surface and into which the interior granular mass flows.

This movement does not take place by chance, but in definite directions, and may be influenced.

The amoeba will move towards certain substances which may be placed in the fluid around it and away from others.

In the water in which the amoebae live there are usually other organisms, particularly bacteria, on which they feed.

When such a bacterium comes in contact with an amoeba, it is taken into its body by becoming enclosed in processes which the amoeba sends out.