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Roots of language was originally published in 1981 by Karoma Press (Ann Arbor). It was the first work to systematically develop a theory first suggested by Coelho in the late nineteenth century: that the creation of creole languages somehow reflected universal properties of language. The book also proposed that the same set of properties would be found to emerge in normal first-language acquisition and must have emerged in the original evolution of language. These proposals, some of which were elaborated in an article in Behavioral and Brain Sciences (1984), were immediately controversial and gave rise to a great deal of subsequent research in creoles, much of it aimed at rebutting the theory. The book also served to legitimize and stimulate research in language evolution, a topic regarded as off-limits by linguists for over a century. The present edition contains a foreword by the author bringing the theory up to date; a fuller exposition of many of its aspects can be found in the author's most recent work, More than nature needs (Harvard University Press, 2014).
This comprehensive text has established itself over the past 20 years as the definitive work in its fields, presenting a thorough coverage of this key area of structural geology in a way which is ideally suited to advanced undergraduate and masters courses. The thorough coverage means that it is also useful to a wider readership as an up to date survey of plate tectonics. The fourth edition brings the text fully up to date, with coverage of the latest research in crustal evolution, supercontinents, mass extinctions. A new chapter covers the feedbacks of various Earth systems. In addition, a new appendix provides a valuable survey of current methodology.
He then assesses the status of judgments as reliable indicators of a speaker's grammar.