This book is a comprehensive guide to the grammar of the Avestan language, the language of the sacred texts of Zoroastrianism. The book compares Avesta with Sanskrit, another ancient Indo-European language and provides an introduction to the history, literature, and religion of the Avesta. The book is an essential resource for scholars and students interested in the comparative study of Indo-European languages and the history and culture of ancient Iran. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.