212 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS hair curl becomes a simpler procedure. The work reported in this note is being ex- panded to examine the flexibility created by this lower chemical activity required to obtain a satisfactory permanent wave. REFERENCES (1) M. Feughelman, "Permanent Set in Single Wool Fibres and the Process of Recovery of Extension," in Proceedings of the 3rd International Wool Textile Research Conference, Section 2 (Paris, 1965), p. 255. (2) M. Feughelman, F. Irani, and Maurine Gan, Stress relaxation of wool fibres in different media at 96øC, Text. Res. J., 38, 1039 (1968). (3) M. Feughelman, "The Mechanism of Set in Bending of ot-Keratin Fibres," in Proceedings of the 8th International Wool Textile Research Conference (Christchurch, New Zealand, 1990), Vol. 1 p. 517. (4) M. Feughelman and B. M. Chapman, The swelling of wool fibres with reduced disulfide content in 98% formic acid, Text. Res. J., 36, 1110 (1966).