The velocity field characteristics of electrons in germanium were measured in a range of temperatures between 33°K and 130°K and the electric field along the ⟨ 100 ⟩ orientation of the crystal. At 33°K a negative differential mobility of 300 cm2/V‐sec was observed with a threshold field of 1.5 kV/cm. The negative differential mobility decreases with increasing temperature. At 130°K there is definitely no negative differential mobility.