Clinical experience has not confirmed previous observations that intravenous injection of vitamin C and intramuscular injection of histidine monohydrochloride are useful in the treatment of peripheral ischemia observed in arteriosclerosis obliterans. Clinical experience with intravenous injection of ether has failed to indicate that this method of treatment is of value in improving the peripheral arterial circulation in thrombo-angiitis obliterans and arteriosclerosis obliterans.