In the article author discusses research carried out on the Polish territories by Cracow scientist and the first professor of physical chemistry - Ludwik Bruner - on kinetics of homogenous and heterogenous systems. The kinetic searches of Bruner were the crucial point in his activity. A small number of publications presenting his most significant achievements appeared so far. Bruner's research works over kinetics can be divided thematically into 2 main parts: - reactions velocity, photokinetics and catalysis of homogenous systems: kinetics of substitution of bromine in aromatic compounds, and addition of bromine to non-saturated compounds, catalysis in bromination and particularly the catalyctic action of iodine, kinetics of estrification; experiments on effect of light on the process and chemical reactions velocity; - kinetics of heterogenous systems: research on the velocity of dissolution of solid bodies according to Noyes - Whitney's standard. Bruner's research works over kinetics played a significant role in the development of scientific research on organic reactions velocity and dissolution velocity.