“…agglutination test, using formolized sheep cells coated with thyroglobulin (Fulthorpe et al, 1961), and the precipitin test in agar. CA2 antibodies fail to react in these tests and can be detected only by the Coons technique, using frozen thyroid sections fixed in meth,cnol (Balfour et atl., 1961 (Gajdusek, 1958;Hackett et al, 1960). All sera giving positive C.F.T.…”