During a trip to Paraguay to strudy the mosquito pest, Prof. Voges, the Director of the National Board of Health at Buenos Ayres, accidentally discovered a remedy for mosquito bites. He had a supply of all kinds of substances, among which was naphthalene, a chemical of no use whatever against the mosquito itself. A surprising result was produced on rubbing this chemical ou mosquito bites. Even when the part stung was greatly inflamed, it had the effect of neutralizing the insect-poison. By rubbing it on the spot immediately after a person has been bitten, the swelling that usually follows does not arise.