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R6sum6. -Les recents progrks experimentaux concernant les metaux de transition, les mktaux des terres rares et leurs alliages liquides sont passes en revue. Les resultats sont compares avec les theories actuelles qui tiennent compte des etats 3d, 4f et 5d respectivement.Abstract. -The recent progress in the experimental work on liquid transition and rare earth metals and their alloys is reviewed. The results are compared with recent theories taking into account the 3d, 4f and 5d states, respectively.1. Introduction. -The data on the Hall coefficient, the Lorenz number, the electrical and thermal resistivity, the thermopower and the magnetic susceptibility of liquid normal metals and their alloys can be interpreted in terms of the nearly-free-electron moael [I]. This model may not be valid in liquid transition and rare-earth metals and their alloys due to the presence of the 3d, 4f and 5d states.The main object of this paper is to review the measurements of the Hall coefficient, the electrical resistivity and the magnetic susceptibility of the liquid transition metals Mn, Fe, Co, Ni and the light rare-earth metals La, Ce, Pr, NU and their concentrated alloys with liquid normal metals. Simple explanations are given for the observed behavior.New results of the electrical resistivity of liquid La, Gd, Tb and Eu, of the Hall coefficient and the electrical resistivity of liquid Co-Ce and of the magnetic susceptibility of liquid alloys of Ce with Cu, Sn, La and Pr and of liquid Co-La and Co-Pr are presented.