1 My best thanks are due to my friend MtAnbalal M. Engineer, B. A. , LL. B., fo¢his invaluable help in correcting and punctuating the text, in collating some miss., and in preparing the index &c. I am alsograteful to MrDaji Sahib Khare, B.A., LL. B., for giving me facilities to get some valuable reference books. I am indebted also to ly friends MrTransukharam S. Tripathi, B. A., Mr Hiralal B. Shrof, B. A. and Mr. Keshavji Nursy for lending me some valuable Sanskrit books. The Taittiriya Upanishad is so called because of the recension (Shhh) of the Krishna- Yajurveda to which it belongs. It is one of the most popular andbest known of the classical Upanishads. It enjoys this popularity and high inmportance, first because, it alone treats, among other things, of the five Koshas (sheaths or vestures of the self); secondly, because of its grand moral and spiritual philosophyAs the doctrine of the Koshas is the pivotal doctrine of the Vedanta on its theoretical as well as its practical side, students should thoroughly understand it before proceeding further in their Vedant study. The late Prof. Max Muller (Vide his [ekota Philosophy, p. 35) remarks that in this Taittiriya Upanishad the uniform purpose running through all of them (the Upanishads), was clearly brought out, and a system of philosophy was erected out of such diverse materials, which is not only perfectly coherent, but quite clear and distinct on almost every point of doctrine.' " No philosophy, ancient or modern, can be said to come within a measurable distance of Shri Shankarबैcharya's. All of them are confined in space and time to the sciences; while Shri Shankaracharya's is bounded on the one hand only by Infinity, and on the other only by Eternity. Instead of speaking in superlative language concerning the
