This volume contains the first eight Upanisads with Sri Sankaracarya's Bhasyas and all the available tikas thereon.  In our search for unpublished Bhasya-tikas we came across Anubhutiswarupacarya's gloss on Agamasastra Bhasya and Narendrapuri's gloss on Candogyabhasya in the Govt.  Oriental Librarl, Madras.  These were found very ancient and scholarly and so we determined to publish them in our edition.  Anubhutiswarupacarya was a teacher of Anandagiri as shown by himself in his Tatvaloka, written in his former asram.  Narendrapuri's commentary is also very scholarly though brief.  It will be published in the next volume.  Gopala tika on Katha, Vanamala and Taittiriya Vartika, tikas on Taittiriya-Bhasya are reprints.  We have published the Vartika also along with the Bhasya to help pandits and scholars who are in pursuit of allround knowledge in the subject. This edition is based upon manuscripts of Bhasyas and tikas preserved in Daksinamurti Matha, Varanasi in addition to the printed texts of Anandasram.  Very good and appropriate reading were found in these manuscripts and they have been incorporated in the texts of Bhasya and Anandagiri.  Another interesting feature in this edition is that we have analysed in the notes the views of Dwaitins and Visistadvaitins in the subject, in our endeavour to make a comparative study of the three schools of philosophy.