The book ""The Hindu-Aryan Theory On Evolution And Involution: Or The Science Of Raja-Yoga"" by Tirumangalum Chrishna Rajan Iyengar is a comprehensive study of the Hindu-Aryan theory of evolution and involution. The author delves deep into the ancient Hindu scriptures and explores the concept of Raja-Yoga, which is the science of attaining spiritual enlightenment through the practice of meditation and self-discipline.The book is divided into two parts, the first part dealing with the Hindu-Aryan theory of evolution and the second part focusing on the practice of Raja-Yoga. In the first part, the author explains the Hindu-Aryan theory of evolution, which is based on the belief that all living beings are evolving towards a higher state of consciousness. He explores the concept of involution, which is the process of spiritual evolution that involves the descent of the soul into matter.The second part of the book focuses on the practice of Raja-Yoga, which is the science of attaining spiritual enlightenment through the practice of meditation and self-discipline. The author explains the different stages of Raja-Yoga and provides practical guidance on how to practice it.Overall, ""The Hindu-Aryan Theory On Evolution And Involution: Or The Science Of Raja-Yoga"" is a must-read for anyone interested in the Hindu-Aryan theory of evolution and the practice of Raja-Yoga. The author's deep understanding of the subject matter and his clear and concise writing style make this book an excellent resource for both beginners and advanced practitioners.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.