“…The sera of both symptomatic and asymptomatic patients with pigeon breeder's disease contain thermostable antibodies which selectively consume human haemolytic complement (6). Jaffe (13), Albus (2) and Cavelti (9) had already realized the potential usefulness of this complement method for the I7O improvement of allergenic extracts; a method for the standardization of house dust allergens along these lines has recently been developed (5). The reaction enjoyed some popularity at the time as the Hecht-Weinberg modification of the Wassermann reaction (12).…”