Experimental properties of Kondo‐type systems in the very low temperature regime are examined using as examples both old and new data on the specific heat, susceptibility, and resistivity, primarily of copper‐based third‐row transition series alloys. Information about theTequal 0°K limit of the entropy and susceptibility of the Cu(Fe) system has been obtained, as well as data showing a specific‐heat peak at 0.45°K in a Cu(Cr) alloy of 32 ppm concentration. The low field susceptibility of Cu(Cr) has been measured down to 15 mK. An interesting systematic variation in the zero temperature limit of the resistivity is pointed out.