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PREFACE. ix disa's commentary on this, too, is short. The present MS. goes to the end of his commentary. Avayavatippant (No. 20), by Jagadisa, contains his commentary on Raghunatha Siromani's Didhiti commentary on the chapter on Avayava of Tattvacintamani. Dravyasara samgraha, by Raghudeva (129), is a short treatise explaining the categories of the amalgamated Nyayavaisesika system of Navadvipa. Raghudeva was a pupil of Harirama Tarkavagisa. His own title was Nyayalamkara. He was a later contemporary of Jagadisa and flourished in the beginning of the 18 th century. the 18 th century. Babu Kanticandra Radhi mentions many commentaries by him, but Dravyasarasamgraha is not in the list. Navinanirmanam (138) by the same Ragudeva Nyayalainkara is a short summary of the substance of the various commentaries, specially of the commentary Gudharthatattvadipika by himself, on the Anumanakhanda of the Tattvacintamani. Stein doubts whether the name of the work is Navinanirmana. He also is not certain what book on Anumana it comments upon. Raghudeva certainly comments upon the Anumanakhanda of the Tattvacintamani. As regards the name I suspect this is Gudharthatattvadipika. Nyayasastrapradipa (149) by Bhattacarya (by which title Gadadhara Bhattacarya of Nadia is generally known) treats of the logical analysis of sentences which forms the subject of the 4 th book, Sabdakhanda of Tattvacintamani. Paramarsadidhititika, by Gadadhara Bhattacarya (152), is a commentary on Raghunatha Siromani's commentary on the chapter of Paramarsa in the Anumana-khanda of the Tattvacintamani. Vatsyayanabhasyanuvyakhya (263), by Gangadhara Kaviraja of Murshidabad, composed in Sana or B.S 1292, that is, twenty five years ago, is a commentary on the Bhasya commentary of Vatsyayana on the Nyayasutras of Gotama. Sabdamaniprakasa (287), by Gopinatha, is a commentary on the 4 th part or Sabdakhanda of the Tattvacintamani. In