It was confirmed that NARBEL was harmless to the respiratory and the circulation organs, and innoxious by lacal injection, as a result of experimentation of the pharmacological action and local injection of NARBEL, a vasoconstrictonal chemical. The clinical experimentation also proved that the bleeding was suppressed by the addition of NARBEL in the local anaesthesia. But NARBEL must be used plentifully, and by reason of this defect the authors hope for the appearance of products of higher concentrations.