Precision electrical resistivity measurements on twelve alloys in the series ${\mathrm{CeSi}}_{\mathrm{x}}$ (1.60\ensuremath{\le}x\ensuremath{\le}1.90) reflect the smooth progression from a magnetically ordered dense Kondo system (x\ensuremath{\le}1.85) to compositions where the conventional single-impurity Kondo effect dominates the exchange interaction, resulting in a ground state which is not magnetically ordered. The variations of the Kondo temperature and the magnetic ordering temperature are determined as a function of Si content and found to agree well with the theoretical Kondo-lattice model.