This book was first printed in 1956. Since then I have never relinquished my researches in the fields of Indian Rhetoric and Aesthetics. Some misinterpretations and mis- takes occurring in the first edition have already been corrected by myself in 1957, in the paper Further Observations On the Abhinavabbarati, East and west, year VIII, N. 1.-April, 1957 pp. 100-103. This new edition represents, I trust, a great im- provement in regard to the first one. The Introduction, the critical apparatus, the translation and the notes have been completely revised. The basic text of Abhinavagupta, i.e, the commentary to the famous sutra by Bharata, VI, after st. 31, vibhavanubhavavyabhicarisamyogad rasanispattib, has been supple; mented by three new texts, viz. the Commentaries on Natyasastra, I, st. 107, on Dhvanyaloka, I, st. 18, and II, st. 4. As to the text I have directly compared the MS of .Abbina- vabharati preserved in the library of Madras (M). References to the Kavi's edition of the .Abhinavabharati are to the second edi- tion of it. The letters He and M. C refer to the viveka of Hemacandra and to the samketa of Manikyacandra respectively. Although the additions and explanations of He do not alter in any way the thought of AG., I have not reproduced them in the text, which I have tried to set forth such as it was before the exegetical activity of the great jaina scholar. In so many changes, one thing has remained unchanged in these ten years : I mean the profound debt of gratitude I owe to Prof. Giuseppe Tucci, to whom, now as then, this book is dedicated.