The book is intended especially as a supplement to Sanskrit Grammar of W.D. Whitney and includes all the views comprehensively of a given root in the Sanskrit language. The author has respected the language of every period, and the great St. Petersburg Lexicon of Böhtlingk and Roth have been his greatest source for materials on epic and classical literature. In the older language of Vedas and Brahmanas and Upanishads and Sutras, he has done much more independent work. The periods in the life of the language which are acknowledged and distin- guished by appropriate notation are six: the Veda (v.); the Brahmana (b.); the Upanishads (u.); the Sutras (s.); the epics (e.); and the common Sanskrit (c.). They have all been adequately explained in detail. The book will be useful to the scholarly community in need of authentic information on Sanskrit language.