There is reliable information that the Germans are preparing great quantities of a special gas, calcium arsenide, which can’t be seen or smelled. It can be spread by shells or bombs or even simply scattered like powder. It is extremely noxious. Ordinary protective masks are useless against it. People are poisoned unawares and die in terrible agony within 24 hours. It is thought that the Germans may use ‘arsenide gas’ during their spring offensive (possibly this is the ‘secret weapon’ of which Hitler spoke a few months ago). In any case, the British general staff is expecting this offensive.