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At our hospital 15 cases of leukaemic reticuloendotheliosis and 4 cases of legionnaires' disease have been diagnosed. 3 patients had both diseases. The clinical findings are reported. It is probable that patients with leukaemic reticuloendotheliosis have an increased susceptibility to Legionnaires' disease. Possible reasons for the decreased resistance are discussed.

Plasma fibronectin was determined using a laser nephelometric method in 10 patients with acute myeloid leukaemia undergoing chemotherapy. There was a continuous fall during the first 3 weeks to about 50% of the normal level. The decrease of fibronectin may contribute to the lowered resistance against infection characteristic of these patients.

Hypercalcaemia developed in a patient with chronic lymphatic leukaemia. The hypercalcaemia did not respond to conventional treatment. At bone biopsy osteoclastic resorption was found (a photomicrograph is presented). 7 cases from the literature of hypercalcaemia and chronic lymphatic leukaemia are briefly reviewed. Possible mechanisms are discussed and it is suggested that osteoclast-stimulating factors may be of importance in the development of the hypercalcaemia.