Synopsis This is the first volume of a study of Panini's work, its antecedents, and the traditions of interpretation and analysis to which it gave rise.  This revised second edition includes the text of Panini's Astadhyayi with indications of changes that were introduced to this text of Panini's Astadhyayi with indications of changes that were introduced to this text and a discussion concerning such changes.  Subsequent volumes take up in full detail issues of interpretation, method, and theory associated with the astadhyayi.  This first volume is meant to provide a basis for such detailed discussions.  Tot his end, the author describes briefly the structure of the Astadhyayi with its ancillaries, outlines Panini's derivational system, and considers in general the principles that guided Panini in composing his grammar in the way he did as well as the grounds on which he arrived at the particular basic forms with which he operates in his derivational system.