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eighteenth and nineteenth centuries part of the local traditions was incorporated in the great General Histories of Java which were being written in Central Java at the time. It is difficult to make a distinction in these texts between really old local tradition and later reconstruction of history. As a matter of course the new Muslim rulers of the Pasisir districts had their genealogies written down as they came into prominence. There is a difference in social background, however, between the Islamic genealogies and the Javanese-Balinese texts which have been discussed in 21.200. The conversion of Java to Islam was due in part to the energy of prosperous middle-class traders of mixed blood. Islam has a tendency to level society. Purity of descent is not deemed of paramount importance. It is likely that social privileges, marriage taboos etc., based on the traditions of old families of rank, and their genealogies, such as have been preserved in Bali for many centuries, disappeared in Java in the period of the rise of Islam in the fifteenth and sixteenth centuries. If is also possible that the tur bulent political history of Java even before that time had done away with many dis tinctions of social classes, and with here ditary privileges of prominent families. The genealogical trees of the Islamic period do not refer to social groups comparable with hereditary castes, but merely to the descend ants of great Kings or holy men. Under the catchwords Surabaya, Grësik, Girt, Tuban and Sëndav, Sidayu manuscripts containing information on these towns are registered in the General Index. At least three sacred graves of walis, apostles of Islam in Java, are found in these towns:

sunan Bam pèl Dënta in Surabaya, sunan Giri in Giri, and sunan Bonap in Tuban. The legendary histories of the walis will be registered under a separate head (24.500). Under the present head the available local histories of the towns are collected. 22.210 Grësik history and genealogy: cod. 6842 (historical notes), 8581 (Grësik notes), 8582 (genealogy, from Muham mad), NBS21, KITLV Or 228 (Sasilah). 22.220 Tuban notes on walis: cod. 8614. 22.230 Sidayu notes: cod. KITLV Or 229 (Sajarah). 22.240 History of Demak-Pajaij-Mataram, Madura origin: cod. CB 140. 22.250 Notes on genealogy: cod. RtMLV 17543. 22.260 Kidut} Arok, old Surabaya legend ary history: cod. 10.544 (= BCB prtf 40: KBG cod. 47). 22.270 Giri-Grësik history, Cëntini begin ning: cod. 8990 no. 3. 22.300 Madurese history. Since olden times the island of Madura has been part of the dominions of Kings ruling in the districts of the Brantas and Beijawan deltas. Immigration of Madurese people into districts of East Java also dates from pre-Islamic times. In some cases a want of arable land may have induced groups of Madurese to leave their arid island, in other cases they were sent to Java as unfree labourers, bond- men of Javanese lords, to work on seignorial estates. No Madurese texts written in pre-Islamic times are in evidence. Apparently for a very