  We report on the observation of large, step-like anomalies in the
magnetization ($\Delta M = 0.74$\,$\mu_{\rm B}$/Ce), in the magnetostriction
($\Delta l/l_{0} = 2.0 \cdot 10^{-3}$), and in the magnetoresistance in
polycrystals of the paramagnetic heavy-fermion system CeTiGe at a critical
magnetic field $\mu_0 H_c \approx $ 12.5\,T at low temperatures. The size of
these anomalies is much larger than those reported for the prototypical
heavy-fermion metamagnet CeRu$_2$Si$_2$. Furthermore, hysteresis between
increasing and decreasing field data indicate a real thermodynamic, first-order
type of phase transition, in contrast to the crossover reported for
CeRu$_2$Si$_2$. Analysis of the resistivity data shows a pronounced decrease of
the electronic quasiparticle mass across $H_c$. These results establish CeTiGe
as a new metamagnetic Kondo-lattice system, with an exceptionally large,
metamagnetic transition of first-order type at a moderate field.
