This paper describes an apparatus designed to carry on the continuous measurement of the water absorption by soils under laboratory conditions. The apparatus was called "sorbímetro". The principle accordingly to the "sorbimetro" works is the same which governs the flow of water in the usual linked flasks. The apparatus has a U tube whose vertical arms are connected respectivelly, to a soil colunn and to a 100 ml burete; the burete keeps constant the volume of water in the U tube since the liquid is being absorbed by the soil. In the present method the readings on the burete substitute for the usual weighings. The method is recommended for measurements in time intervals in which the gravimetric method does not work too well.