“…concentrations > 200 units/ml. (Tada and Ishizaka, 1970) (tonsil and adenoid tissue, bronchial and peritoneal lymph nodes, and respiratory and gastrointestinal mucosa), and IgE is present in a number of secretions including bronchial (Waldman, Virchow, and Rowe, 1973), middle ear (Ishikawa, Bernstein, Reisman, and Arbesman, 1972), lacrimal (Brauninger and Centifano, 1971), salivary (Ozkaragoz, Smith, and Gokcen, 1972), nasal (Donovan, Johansson, Bennich, and Soothill, 1970;H{ubday, Cake, and Turner, 1971), and urinary (Turner, Johansson, Barratt, and Bennich, 1970;Barratt, Turner, and Johansson, 1972;Stokes, Hosking, Turner, and Johansson, 1973 Urquhart andothers(1965), who have shown that, in rats infected with the nematode, Nippostrongylus brasiliensis, the formation of IgE-like antibodies in response to the infection leads to the successful control of the infection. It has been postulated that the rat, in order successfully to purge its gastrointestinal tract of the parasite, must form this IgE-like antibody.…”