Hemorrhagíc tendency and granulocytopenia due to prolonged contact with trichloroethylene and toluene are described in a boy whose hobby was model air-plane assembly. The hemostatic defects found were hypoproconvertinemia, moderate hypofibrinogenemia, and increased capillary fragility. The clinical and laboratory abnormalities disappeared following interruption of the exposure. The abnormalities in the coagulation mechanism are ascribed to a toxic effect of the trichloroethylene on the liver, while the granulocytopenia is considered to reflect a bone marrow-depressing action of benzene contaminating the toluene. The increased capillary fragility is presumed to be due to a toxic effect of the chemicals on the blood vessels.