This monograph is based upon work done with me at the University of Chicago some five years ago by Baidyanath Sastri for the degree of A.M. So much additional material has been added, so many changes have been made, and so many of the views expressed would be unacceptable to him that I have not felt justified in placing his name, too, upon the title-page as joint-author and thereby making him responsible for many things of which he might not approve,
Harvard University
April, 1929
While reading the final page-proof I learned of the publication by Prabodh Chandra Sengupta of a translation of the Aryabhatiya in the Journal of the Department of Letters (Calcutta University), XVI (1927). Unfortunately it has not been possible to make use of it in the present publication.
April, 1930
