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Historical linguistic theory and practice contains a great number of different 'layers' which have been accepted in the course of time and have acquired a permanency of their own. These range from neogrammarian conceptualizations of sound change and analogy to presentday ideas on rule change and language mixture. To get a full grasp of the principles of historical linguistics it is therefore necessary to understand the nature and justifications (or shortcomings) of each of these 'layers', not just to look for a single 'overarching' theory. The major purpose of the book is to provide in uptodate form such an understanding of the principles of historical linguistics and the related fields of comparative linguistics and linguistic reconstruction. In addition, the book provides a very broad exemplification of the principles of historical linguistics.
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