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In lieu of an abstract, here is a brief excerpt of the content:Reviewed by:Nonexistent Objects in Buddhist Philosophy: On Knowing What There Is Not by Zhihua YaoChong Fu (bio)Nonexistent Objects in Buddhist Philosophy: On Knowing What There Is Not. By Zhihua Yao. London: Bloomsbury Academic, 2020. Pp. 186. Hardcover £29.99, isbn 978-1-35-012148-5. Nonexistent Objects in Buddhist Philosophy: On Knowing What There Is Not, by Zhihua Yao, cogently strings together different Buddhist schools' varied philosophical approaches to the cognition of nonexistent objects (asadālambanajñāna) or non-cognition (anupalabdhi). Non-being and the knowledge of non-being have long been central to nearly every philosophical tradition. Buddhist philosophy, in particular, invests extraordinary intellectual effort to deal with these topics, since non-being (asat/abhāva) occupies a central role in the Buddhist doctrine. Yao acutely reconstructs a brief history of this philosophical enterprise of Buddhism from the early sectarian period to the time when the so-called logico-epistemological school prevailed. The book consists of an introduction and eight chapters. These eight chapters are basically based on Yao's previously published articles. They are further arranged into two parts: (1) "Cognition of Nonexistent Objects: A Historical Development" and (2) "Epistemological Approaches to Nonexistence." The first part discusses how philosophers from the Mahāsāṃghika, the Dārṣṭāntika, and the Yogācāra analyze the cognition of nonexistent objects. The philosophical development concerning this particular topic is masterfully articulated by Yao. This mastery is best shown in his unveiling of Yogācāra's philosophical inheritance from its Abhidharma legacy. In addition, his reconstruction deepens our understanding of the intricate history of sectarian Buddhism in a broader sense. The second part centers on the philosophical issues of nonexistence raised by the Buddhist logico-epistemological school. Yao's translation, presentation, and comparison of these philosophical arguments is strikingly lucid and comprehensive. Overall, one salient contribution of this book is that it highlights the importance of Pāli and Chinese sources in studying the history of Buddhist philosophy, especially Indian Buddhist philosophy. In Part 1, Yao's reconstruction of sectarian Buddhist philosophies is heavily based on the Pāli text Kathāvatthu and the Chinese translations of Samayabhedoparacanacakra, Śāriputrābhidharma, Vijñānakāya, Mahāvibhāṣā, *Janakaparamopadeśa, and Nyāyānusāra, whose Sanskrit or Prakrit originals have long been lost. In part 2, in [End Page 1] addition to comprehensively assessing Sanskrit and Tibetan materials, Yao detects a much-hidden philosophical development from Īśvarasena to Dharmakīrti by relying on Chinese commentaries composed by Chinese and Korean monks in the Tang Dynasty. Chapter 1 is of the most importance in the book; in it, Yao traces "an early origin of the concept of the cognition of nonexistent objects among the Mahāsaṃghikas and some Vibhajyavādins under their influence" (p. 13). Yao sensitively points out that "the thesis that latent defilements (Pāli: anusaya/Skt: anuśaya) have no objects constitutes the first step toward the formation of the concept of the cognition of nonexistent objects" (p. 19). The next step, as Yao analyzes it, is the proposition of awareness (Pāli: ñāṇa/Skt: jñāna) without objects due to the Mahāsaṃghikas and its sub-schools. Yao's philosophical reconstruction is eloquent and perceptive, especially when he outlines a crucial conceptual transition from the awareness that is without objects (anālambanaṃ jñānam) to the awareness that has nonexistent objects as its objects (asadālambanajñāna). However, one of the main supporting materials that he believes mentions the awareness that has nonexistent objects as its objects -- a passage from the Śāriputrābhidharma -- might be found less supportive without a more detailed justification. This passage is concerned with the concept of wu jingjie zhi 無境界智:What is the awareness without objects (wu jingjie zhi 無境界智)? There is no awareness without objects. Or, the awareness that arises when conceptualizing the past and the future dharmas is called the awareness without objects.1《舍利弗阿毘曇論》卷 9〈4 智品〉：「云何無境界智？無無境界智。復次思惟過 去未來法智生，是名無境界智。」(CBETA 2022.Q4, T28, no. 1548, p. 593c16–18)。Yao chooses an alternative reading based solely on the Taisho Edition, which interpolates one more 境 in 無無境界智 as 無境無境界智. This reading might result in a wholly different meaning: "What is awareness without objects? Any awareness that...