The present book consists lectures on Vaisnavism and Tantricism by Dr.M.N. Sircar which are delivered as "Sri Krsna" Extension on "Aryan Dharma." The author himself, a mystic, is fit to deal with the theme and he has done thorough justice to it by his masterly and exhaustive treatment in a lucid style, so that the subject though abstruse, has been made interesting and intelligible.This book will be a distinct contribution to world thought and culture for a proper understanding of the grandeur, depth and dignity of Hindu Mysticism.