Low‐temperature specific heats were measured in the systems of borides Co2B&sngbnd;Ni2B and FeB&sngbnd;CoB, especially nearcF, the critical composition for ferromagnetism. In the critical concentration range the linear term &ggr;Tis largely increased and the specific heat curves reveal anomalies at low temperature. Except for thiscFrange, the &ggr; values, in conformity with the magnetic moments, describe the filling up of adband in a rigid band model.