This work is an exposition of the philosophic conceptions basic to Mahayana Buddhsim as found in the Maha-prajnaparamita-sastra a commentary on the Prajnaparamita-sutras and traditionally attributed to Nagarjuna. The sastra the earlist and most extensive work in this field is lost in its sanskrit original and preserved only in a Chinese translation. Meaning of sanskrit and chinese terms are expounded concepts are made clear and supplementary materials are supplied in the notes