The fourth (in the present order) of the seven books of the Abhidhamma Piṭaka. It is, however, generally considered to be the earliest of the Abhidhamma books. Its subject matter is the person (puggala). The author first gives a table of contents of the whole work, and then follows the method of the Aṅguttaranikāya, grouping human types first under one term, then under two, and so on up to ten. Several of the sections are found, almost complete, in the corresponding sections of the Aṅguttaranikāya. Others are found in the Saṅgīti Sutta. For details see Morris’ edition in the P.T.S. series (Introd. x xi).