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History and Sources
35
tary by Akalanka himself. Vadiraja the great logician, has written a big commentary on it.
(3) Pramana samgraha: It is a sort of supplement to Nyāya Viniścaya containing eighty seven and a half stanzas divided into nine Prastavas on the following subjects :
(i) Definition of perception, Śruta preceded by perception, inference or authority; result of pramaņa, the definition of real perception and other topics related with it.
(ii) Memory, Recognition and Tarka as divisions of mediate cognition.
(iii) Inference and the parts of syllogism with other allied topics.
(iv) Refutation of the three factors (trilakṣaṇa) admitted by the Buddhist as essential conditions for a valid hetu and confirmation of anyathanugapatti; the different types of hetus.
(v) Hetvābhāsas or fallacies of the middle term.
(vi) Rules and kinds of debates.
(vii) Agama and the Omniscient.
(viii) Saptabhang and naya. (ix) Naya and nikṣepa.
(4) Siddhiviniscaya : In its original form it is not available. A commentary of it is found in manuscript only. Unlike Astaśati and Vivaraṇa, this commentary does not quote the original text. It is, therefore, impossible to restore the original work. The commentary contains twelve prastavas dealing with various topics pertaining to logic and ontology.
Some other works like Nyayacūlikā, Svarūpasambodhana, Akalankastotra etc. are attributed to Akalanka; but, their authenticity is doubtful.
HARIBHADRA (813-883)
Haribhadra lived just after Akalanka or must have been his younger contemporary. He was a versatile genious with
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