Normalcy and the morbid have their ontological style" (Maurice Natanson 1974: 251) Various perspectives have been applied to the study of illness and healing rituals by anthropologists in a variety of different cultural contexts. These have been influenced by conventional anthropological paradigms, such as structural-functionalism, or by rapidly conventionalizing ones, such as LBvi-Straussian structuralism. Anthropologists have also felt free to borrow from psychology and Freudian and neo-Freudian psychoanalytic theory. One perspective that has received comparatively little attention from anthropologists is that developed by G. H. Mead, recognized as perhaps the single most important influence on the sociological tradition known as "symbolic interactionism," and the closely allied approach of social phenomenology (see Natanson 1973Natanson , 1974. These approaches have, of course, received wide currency in the study of illness, and particularly mental illness, in western contexts, but aside from a few isolated examples (Young 1976; Manning and Fabrega 1973, in relation to illness; and Geertz 1966, more generally) they have not received close attention from anthropologists. This paper is oriented, therefore, to the demonstration of the relevance of these approaches, and especially the perspective developed by Mead in Mind, Self and Society (19341, specifically to the anthropological study of illness and rituals of healing.' I am mainly concerned with the process of the definition of illness and with maior rites of healing insofar as these reveal processes relating to the construction and negation of the individual social se1f.I Mead is concerned with the process of the emergence of a Self. I will elaborate later the main aspects of Mead's argument in my application of it to material collected in Sri Lanka. The thrust of my argument, however, organized in accordance largely with the Meadian framework, i s that the definition of illness in the demonic mode constitutes a process that can lead to the negation of the "normal" Self as this is socially constructed and culturally typified.' The performance of a healing ritual both re-represents this process, in effect symbolically presents it and develops it in accordance with cultural typifications of what constitutes an "abnormal" nonsocial self, and establishes a process whereby the normal social Self is reconstructed.I stress that in the analysis that I present, no statement is made to the effect that individuals who are defined as demonically ill or who undergo the maior rites that I describe Major exorcism rituals in Sri Lanka attempt to transform the identity of a patient from one of illness to one of health. The cultural "logic" of this is described and understood in terms of an analytical approach developed from the work of C. H. Mead and the closely associated work of certain social phenomenologists. The approach adopted in this paper, although argued mainly in relation to Sinhalese healing rituals, is considered as be ing capable of extension to other forms...