[Technics of measuring the motive force of very small ameboid cells]

A technic have been perfected which measures directly the motive force of very small ameboid cells and indicates the tropism of the amoeba. By using this technic, the motive force of Entamoeba histolytica was measured. It varied between +/- 1.5 x 10-4 dyne. We have also shown chimiotactism in Entamoeba histolytica. The metabolic coumpound excreted by this cell induced negative tropism.