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A general formalism for covariant W 3 string scattering is given. It is found necessary to use screening charges that are constructed from the W 3 fields including ghosts. The scattering amplitudes so constructed contain within them Ising model correlation functions and agree with those found previously by the authors. Using the screening charge and a picture changing operator, an infinite number of states in the cohomology of Q are generated from only three states. We conjecture that, apart from discrete states, these are all the states in the cohomology of Q.

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It was Ronald Dworkin who, nearly 30 years ago, urged us to 'take rights seriously' (1977). It is a pity that his argument did not specifically extend to children. Indeed, that in a little noticed passage a decade later he stumbled on the dilemma of what 'Hercules' (the ideal superhuman judge) should do when he thought 'the best interpretation of the equal protection clause outlaws distinctions between the rights of adults and those of children that have never been questioned in the community, and yet he. .. thinks that it would be politically unfair.. .. for the law to impose that view on a community where family and social practices accept such distinctions as proper and fundamental' (Dworkin, 1986, 402). Nor has he ever returned to this dilemma; a pity because it beautifully encapsulates the problem of what to do when the supposedly 'right answer' is morally the 'wrong answer'. When Taking Rights Seriously was published we were in the heyday of the children's liberation movement. This was the era of Farson (1978) and Holt (1975). Their thesis is ripe for reassessment, but it is clear that at the time its impact was limited. Dworkin was clearly unaware of it, as indeed he was of other children's rights literature of the 1970s and earlier. 1 My own first foray into writing on children's rights was in 1980, the text of a lecture given to celebrate the International Year of The Child in 1979 (1980). The Rights and Wrongs of Children (1983) emerged four years later. Then followed the Brian Jackson Memorial Lecture in Huddersfield in 1987 (1988) which advocated that we take children's rights seriously, and a paper at a workshop on 'children, rights and the law' at the ANU in 1991 which emphasised the need to take children's rights' more seriously' (1992). By then, of course, there was the United Nations Convention on the Rights of the Child, which was swiftly ratified by virtually the whole world 2 , and there were developments in legal systems which suggested that children's rights were indeed being taken seriously or at least a lot more seriously than previously. 3