The authors present their studies on the cytologic and some immunologic features of leukemic cells which determine the specificity of lymphocyte population in the various forms of lymphatic leukemia. 133 patients who were treated in their clinic for the period 1980-1984 were studied. Four clinical forms were differentiated which had been published elsewhere. The morphologic and cytochemical differences of lymphatic leukemia cells in the different variants of the disease are pointed out. Applying the tests for rosette formation, blast transformation and immunofluorescence they have proved immunologic differences in the lymphocyte population of the different forms of the disease.
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