In ancient India, learning spanned four quarters of one's life. Learning was sought from the teacher, from one's individual effort, from fellow students and in the last quarter, from the school of life itself. This book belongs to the third quarter for students of Ayurveda regardless of their background in medicine, science, or humanities. Apart from topics in the eight branches of Ayurveda, the book also deals with Ayurvedic Biology which seeks to study the concepts and procedures of Ayurveda with the tools of modern biology.