The author reports his experiences with renal complications following infections with malaria and blackwater fever as observed during his service in the tropics. The epidemiology is discussed in all its details. The author emphasizes the importance of early and correct diagnosis. Timely medical intervention furnishes good results, while neglect may lead to irreparable renal lesions. It may be suggested that the renal observations reported point rather to a prevalence of nephrotic complications than to the existence of a true glomerulonephritis.