1. Dakin's hypochlorite and chloramine-T solutions will protect pigeons against multiple fatal doses of the toxin of Bacillus welch when the antiseptic and the toxin are mixed in vitro and allowed to stand in contact for 5 minutes before injection.
2. The detoxicating action of the solutions is demonstrable also in the presence of serum.
3. Phenol solution, 0.25 per cent, has no such action.